At my place of employment, we use Python for everything by default because "everyone knows Python" (which hasn't really been true of our small team where multiple members have far more experience in other languages than Python).

It grows, in my opinion, out of a desire for programmers to be interchangeable code extruders. The idea that a company might have to train anyone, or that a new hire might have to gradually adjust to a team's chosen languages and idioms, is antithetical to the dream of programmers as cheaply replaceable cogs in the machine.

This is a chicken-and-egg problem, and I suspect it can only really be solved when the labor market for programmers heavily favors workers. It's only then that large numbers of professional programmers significantly weigh aesthetics of language in their choices of job. It's also then that startups, which might have cultures that are more opinionated and/or less risk averse when it comes to language choice, are abundant and thriving. The rise of Python at Google worked on that same basis, didn't it?

I don't know that anyone can control the fate of a programming language like this. Maybe all you can do is make sure it's a lovely, useful language and the rest is up to fate.