Specifically, do you worry that Microsoft is going to eventually do the Microsoft thing and horribly fuck it up for everyone? I've really grown to appreciate the language itself, but I'm wary of it getting too ingrained at work only to have the rug pulled out from under us when it's become hard to back out.
Edit: not really "pulling the rug", but, you know, doing the Microsoft classic.
Everything is temporary. If we were talking about a niche language, I might worry a little bit that it could just lose momentum and die. But TS is a juggernaut. The only way typescript “dies” is if JS integrates enough of its features to make it redundant.
Besides that, if Oracle managed to allow Java to continue to grow and flourish, I have confidence that MS can do at least that well. I also think lumping all of MS’s products into the same boat is a mistake. They have been pretty good stewards of their languages for decades.
I actually drew that same Oracle comparison. They've made the occasionally bullshit effort, e.g. the API stuff with Google, but otherwise Java is just kinda Java. Fair point.