Why hasn't your toolbox evolved to a single hammer? Besides, even if one language ends up being the only one needed, I'd be pretty confident that it's way too

Why hasn't your toolbox evolved to a single hammer? Besides, even if one language ends up being the only one needed, I'd be pretty confident that it's way too early in the study of programming languages, compilers and runtimes too try to stop experimenting and look some language to settle down.