I think you've got it backwards. Fifteen years ago we had jQuery and not a whole lot else. Everyone just used the "building blocks" libraries of js. But then the community and the ecosystem grew exponentially, and we have innumerable choices. Python is similar: I can think of a half dozen ways off the top of my head to build a web app. At least Python was on top of standardizing things like WSGI, but even then you can see rough edges like the non-interoperable nature of concurrent code (twisted vs tornado vs greenlets vs threading vs multiprocessing vs asyncio etc).

Rust will have the same thing happen in another decade or so. It's prevalence will grow the community, which will grow the ecosystem, and the positive feedback loop will mean that there's a huge amount of choice. That's a good thing, but it will have downsides, like decreased interoperability (unless the language evolves). JavaScript was cursed for a very long time by leadership that was essentially asleep at the wheel.