If D becomes a failure, what's the key reason, do you think?

[Tesuji]

In article <e8l426$26o3$1 at digitaldaemon.com>, Don Clugston says...
>
>It's all in the libraries. D is a fantastic language to write libraries 
>for. That's where you get the benefit from all the incremental 
>improvements. If const-by-default enables the creation of much better 
>libraries, then it's worth the pain. If it doesn't, don't do it.
>Ruby had this huge surge in popularity not because of the language, but 
>because of the library Ruby On Rails. Developing good libraries requires 
>a stable language, and we don't have that right now. The 
>protection/module system seems to be completely broken.

Agreed, in addition I also believe that a const-by-default C++ like reference
type is needed before any container library (like DTL) can be effectively
written. Currently D is lacking in this area where C++ is strongest. relying
solely on built-in array / hash is hardly the solution.