I personally wouldn't want to live in a world in which I could only use "one of these 5 languages", whatever those are. But I would love to live in a world where things weren't so deep in abstraction and complexity. These are two very different problems.
One aspect is that it would make an interesting situation at the borders between states. And that's kinda sorta what we have now with programming languages.
> Stuff on top of stuff on top of stuff.
Couldn't that also be too many choices? Like if you specialize in JS instead of C, you're not going to have all the knowledge a C expert might know. Instead of utilizing proven, existing C libraries, you're going to write stuff from scratch in JS?
If everyone uses the "proven" libraries and languages and whatever we'll have no innovation. I don't want to live in a rigid world where we somehow ended up choosing a set of things and nobody uses anything else; I want to see more software written in weird languages. Arguments that go like "but nobody is gonna learn a whole language to contribute to your stuff" are depressing - if it's good, I, like many others, would. Without experiments like these we'd still be in the 60s using COBOL because it's "industry proven" or "battle tested" or "blazingly fast" or whatever. That world is boring.
This is Hacker News after all.