Is .NET 5.0 and C# 9 a "threat" to D?

[Kagamin]

Here's a list of libraries used by a tiny aspnet core application:
Microsoft.AspNetCore.Antiforgery.dll
Microsoft.AspNetCore.Authentication.Abstractions.dll
Microsoft.AspNetCore.Authentication.Core.dll
Microsoft.AspNetCore.Authorization.dll
Microsoft.AspNetCore.Authorization.Policy.dll
Microsoft.AspNetCore.Connections.Abstractions.dll
Microsoft.AspNetCore.Cors.dll
Microsoft.AspNetCore.Cryptography.Internal.dll
Microsoft.AspNetCore.DataProtection.dll
Microsoft.AspNetCore.DataProtection.Abstractions.dll
Microsoft.AspNetCore.Diagnostics.Abstractions.dll
Microsoft.AspNetCore.Hosting.dll
Microsoft.AspNetCore.Hosting.Abstractions.dll
Microsoft.AspNetCore.Hosting.Server.Abstractions.dll
Microsoft.AspNetCore.Html.Abstractions.dll
Microsoft.AspNetCore.Http.dll
Microsoft.AspNetCore.Http.Abstractions.dll
Microsoft.AspNetCore.Http.Extensions.dll
Microsoft.AspNetCore.Http.Features.dll
Microsoft.AspNetCore.JsonPatch.dll
Microsoft.AspNetCore.Localization.dll
Microsoft.AspNetCore.Mvc.dll
Microsoft.AspNetCore.Mvc.Abstractions.dll
Microsoft.AspNetCore.Mvc.ApiExplorer.dll
Microsoft.AspNetCore.Mvc.Core.dll
Microsoft.AspNetCore.Mvc.Cors.dll
Microsoft.AspNetCore.Mvc.DataAnnotations.dll
Microsoft.AspNetCore.Mvc.Formatters.Json.dll
Microsoft.AspNetCore.Mvc.Localization.dll
Microsoft.AspNetCore.Mvc.Razor.dll
Microsoft.AspNetCore.Mvc.Razor.Extensions.dll
Microsoft.AspNetCore.Mvc.RazorPages.dll
Microsoft.AspNetCore.Mvc.TagHelpers.dll
Microsoft.AspNetCore.Mvc.ViewFeatures.dll
Microsoft.AspNetCore.Razor.dll
Microsoft.AspNetCore.Razor.Language.dll
Microsoft.AspNetCore.Razor.Runtime.dll
Microsoft.AspNetCore.ResponseCaching.Abstractions.dll
Microsoft.AspNetCore.Routing.dll
Microsoft.AspNetCore.Routing.Abstractions.dll
Microsoft.AspNetCore.Server.Kestrel.dll
Microsoft.AspNetCore.Server.Kestrel.Core.dll
Microsoft.AspNetCore.Server.Kestrel.Https.dll
Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.dll
Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.dll
Microsoft.AspNetCore.StaticFiles.dll
Microsoft.AspNetCore.WebUtilities.dll
Microsoft.CodeAnalysis.dll
Microsoft.CodeAnalysis.CSharp.dll
Microsoft.CodeAnalysis.Razor.dll
Microsoft.DotNet.PlatformAbstractions.dll
Microsoft.EntityFrameworkCore.dll
Microsoft.EntityFrameworkCore.Abstractions.dll
Microsoft.EntityFrameworkCore.Relational.dll
Microsoft.EntityFrameworkCore.SqlServer.dll
Microsoft.Extensions.Caching.Abstractions.dll
Microsoft.Extensions.Caching.Memory.dll
Microsoft.Extensions.Configuration.dll
Microsoft.Extensions.Configuration.Abstractions.dll
Microsoft.Extensions.Configuration.Binder.dll
Microsoft.Extensions.Configuration.EnvironmentVariables.dll
Microsoft.Extensions.Configuration.FileExtensions.dll
Microsoft.Extensions.DependencyInjection.dll
Microsoft.Extensions.DependencyInjection.Abstractions.dll
Microsoft.Extensions.DependencyModel.dll
Microsoft.Extensions.FileProviders.Abstractions.dll
Microsoft.Extensions.FileProviders.Composite.dll
Microsoft.Extensions.FileProviders.Embedded.dll
Microsoft.Extensions.FileProviders.Physical.dll
Microsoft.Extensions.FileSystemGlobbing.dll
Microsoft.Extensions.Hosting.Abstractions.dll
Microsoft.Extensions.Localization.dll
Microsoft.Extensions.Localization.Abstractions.dll
Microsoft.Extensions.Logging.dll
Microsoft.Extensions.Logging.Abstractions.dll
Microsoft.Extensions.ObjectPool.dll
Microsoft.Extensions.Options.dll
Microsoft.Extensions.Primitives.dll
Microsoft.Extensions.WebEncoders.dll
Microsoft.Net.Http.Headers.dll
Microsoft.Win32.Primitives.dll
Microsoft.Win32.Registry.dll
Newtonsoft.Json.dll
Newtonsoft.Json.Bson.dll
Remotion.Linq.dll
Swashbuckle.AspNetCore.dll
Swashbuckle.AspNetCore.Swagger.dll
Swashbuckle.AspNetCore.SwaggerGen.dll
Swashbuckle.AspNetCore.SwaggerUI.dll
System.AppContext.dll
System.Buffers.dll
System.Collections.dll
System.Collections.Concurrent.dll
System.Collections.Immutable.dll
System.Collections.NonGeneric.dll
System.Collections.Specialized.dll
System.ComponentModel.dll
System.ComponentModel.Annotations.dll
System.ComponentModel.EventBasedAsync.dll
System.ComponentModel.Primitives.dll
System.ComponentModel.TypeConverter.dll
System.Composition.AttributedModel.dll
System.Composition.Convention.dll
System.Composition.Hosting.dll
System.Composition.Runtime.dll
System.Composition.TypedParts.dll
System.Configuration.ConfigurationManager.dll
System.Console.dll
System.Data.Common.dll
System.Data.SqlClient.dll
System.Diagnostics.Contracts.dll
System.Diagnostics.Debug.dll
System.Diagnostics.DiagnosticSource.dll
System.Diagnostics.FileVersionInfo.dll
System.Diagnostics.PerformanceCounter.dll
System.Diagnostics.Process.dll
System.Diagnostics.StackTrace.dll
System.Diagnostics.TextWriterTraceListener.dll
System.Diagnostics.Tools.dll
System.Diagnostics.TraceSource.dll
System.Diagnostics.Tracing.dll
System.Drawing.Primitives.dll
System.Dynamic.Runtime.dll
System.Globalization.dll
System.Globalization.Calendars.dll
System.Globalization.Extensions.dll
System.Interactive.Async.dll
System.IO.dll
System.IO.Abstractions.dll
System.IO.Compression.dll
System.IO.Compression.ZipFile.dll
System.IO.FileSystem.dll
System.IO.FileSystem.DriveInfo.dll
System.IO.FileSystem.Primitives.dll
System.IO.FileSystem.Watcher.dll
System.IO.IsolatedStorage.dll
System.IO.MemoryMappedFiles.dll
System.IO.Pipelines.dll
System.IO.Pipes.dll
System.IO.UnmanagedMemoryStream.dll
System.Linq.dll
System.Linq.Expressions.dll
System.Linq.Parallel.dll
System.Linq.Queryable.dll
System.Memory.dll
System.Net.Http.dll
System.Net.NameResolution.dll
System.Net.NetworkInformation.dll
System.Net.Ping.dll
System.Net.Primitives.dll
System.Net.Requests.dll
System.Net.Security.dll
System.Net.Sockets.dll
System.Net.WebHeaderCollection.dll
System.Net.WebSockets.dll
System.Net.WebSockets.Client.dll
System.Numerics.Vectors.dll
System.ObjectModel.dll
System.Private.ServiceModel.dll
System.Reflection.dll
System.Reflection.DispatchProxy.dll
System.Reflection.Extensions.dll
System.Reflection.Metadata.dll
System.Reflection.Primitives.dll
System.Resources.Reader.dll
System.Resources.ResourceManager.dll
System.Resources.Writer.dll
System.Runtime.dll
System.Runtime.CompilerServices.Unsafe.dll
System.Runtime.CompilerServices.VisualC.dll
System.Runtime.Extensions.dll
System.Runtime.Handles.dll
System.Runtime.InteropServices.dll
System.Runtime.InteropServices.RuntimeInformation.dll
System.Runtime.Numerics.dll
System.Runtime.Serialization.Formatters.dll
System.Runtime.Serialization.Json.dll
System.Runtime.Serialization.Primitives.dll
System.Runtime.Serialization.Xml.dll
System.Security.AccessControl.dll
System.Security.Claims.dll
System.Security.Cryptography.Algorithms.dll
System.Security.Cryptography.Cng.dll
System.Security.Cryptography.Csp.dll
System.Security.Cryptography.Encoding.dll
System.Security.Cryptography.Primitives.dll
System.Security.Cryptography.X509Certificates.dll
System.Security.Cryptography.Xml.dll
System.Security.Permissions.dll
System.Security.Principal.dll
System.Security.Principal.Windows.dll
System.Security.SecureString.dll
System.ServiceModel.NetTcp.dll
System.ServiceModel.Primitives.dll
System.Text.Encoding.dll
System.Text.Encoding.CodePages.dll
System.Text.Encoding.Extensions.dll
System.Text.Encodings.Web.dll
System.Text.RegularExpressions.dll
System.Threading.dll
System.Threading.Overlapped.dll
System.Threading.Tasks.dll
System.Threading.Tasks.Extensions.dll
System.Threading.Tasks.Parallel.dll
System.Threading.Thread.dll
System.Threading.ThreadPool.dll
System.Threading.Timer.dll
System.ValueTuple.dll
System.Xml.ReaderWriter.dll
System.Xml.XDocument.dll
System.Xml.XmlDocument.dll
System.Xml.XmlSerializer.dll
System.Xml.XPath.dll
System.Xml.XPath.XDocument.dll
214 files, 32mb.