Forgive me for my lack of knowledge but say that scenario unfolds and it does get forked out. Does a fork work the same way as an app per say? They just make their own version and people can choose to transition or would the fork force everyone to transition? Do you just stop using the platforms that commit to it and it would be something obvious such as a whole new Bitcoin coin (Bitcoin Cash, Wrapped Bitcoin etc.)

I guess I'm just trying to understand if it will be something obvious and easily avoidable.