It seems like the answer is pretty obvious. That subset of the community stops using it and uses something else, and the others either follow them or don't.

You, if you're not in the first group, can continue to use both to communicate with everyone, but some of them lose the ability to communicate with each other.

The ideal outcome is for everyone to stop using the intolerable thing and switch to a tolerable thing. That's even what often happens over time, but not always immediately. Probably do anything you can to make it happen faster.