Personally, I don't believe that a proliferation of programming languages is really required. Most languages do the same sort of thing with slightly different syntax and degrees of efficiency. If you're really unhappy and frustrated about the current state of programming languages my advice is to go and develop your own.
I think the proliferation of languages is due to people following your advice: they go off to make their own language, realize it's hard to make something radically different and end up just fixing a couple of their pet peeved from another language.
