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.
I'm not really sure what you have against Microsoft, or what "Microsoft classic" you'd be referring to...
In the last 10 years or so they pretty much moved everything C# related to Core, cross platform and open source. Even the decision making for the language is "Open source" - Microsoft is not really behaving the same as the Microsoft from 2000...
Soo, I don't really know how they could possibly fuck it up. They might add more and more features you might not like, but you could just choose to stick to an older version of the language