>> A single language needed to solve all problems is a fallacy.

> Has that been proven and do we have pointers to any peer reviewed papers on that?

I agree with you and can't stand it when people say things like: "All languages have their strengths and weeknesses" or "you just need to choose the right tool for the job".

I can't see any reason a clean and simple language can't have high level constructs when you want them and low level performance when you need it. It's just that no one has done it well enough yet.