"I say this because I'm a bit worried that long term Python has locked itself into a corner where it will keep getting pushed into as the other languages develop a better developer UX."

You can stop worrying. That is absolutely what will happen.

But it is a good thing. Languages should be something, not merely an accumulation of every fad and trend that appeared over its lifetime. That means eventually they will mature, and eventually hit a peak, and then fade. But during that process, at least you'll have a nice, mature language, instead of one always chasing the latest pretty-shiny, immature, confusing, crammed with too many features, with libraries constantly jerking around trying to keep up and always just a bit broken. Indeed, I kind of thing Python has already done a bit too much of the latter, and were I in charge of Python I'd give some serious attention to the idea of simply freezing the core language.

Python is what it is. Let it be what it is, because what it is is pretty good. It's by far my favorite language of the genre it is in. It's got way too much baggage to compete in the next arena, so let it be the master of the one it is in instead.