Simplifying templates

[Kagamin]

And you'd better get acquainted with
http://www.digitalmars.com/d/2.0/template.html
http://www.digitalmars.com/d/2.0/template-mixin.html
http://www.digitalmars.com/d/2.0/templates-revisited.html
http://www.digitalmars.com/d/2.0/variadic-function-templates.html
http://www.digitalmars.com/d/2.0/template-comparison.html
and figure out whether you proposal barely covers all D templates use cases.