Maybe they will but the majority will need to agree for it to become the dominant chain. And if not the minority chain will still exist and can be used by whoever chooses to use it. The key is you cannot force ppl what chain to support.
Discussion
I agree with the last sentence but idk how relevant it is to current landscape.
But on the other hand if everyone dumps Saylor-Blackcockcoin it will become just another BCH or BSV or one of the many failed forks.