I'm so glad I work for a remote company that states in my employment contract my job is a remote job (or at least, it doesn't specify in-office requirements), so if they ever try to force me to relocate, it would be considered a constructive dismissal and then I get to collect unemployment benefits until I find a new job. That probably won't happen though cause we have people working all across the country. Though, this isn't in USA so maybe things are different there.

Of course, always get your contracts reviewed by an employment lawyer.