Friendship is Magic, and Magic is Heresy.
It will be interesting to see which way they go. If they go their own way and pull most of their fans with them I think that’s probably a good thing - the people that want to dungeon crawl can dungeon crawl, and people that want a game like CR can play that system.It's far more likely CR will take up the slack than the whole of the 5E ecosystem simply pivots to one new system. Or both. CR publishes and the whole 5E ecosystem goes with them.
On the other hand, they haven’t said much as of yet, as might just as likely double down and go onednd for whatever their next season (or whatever the relevant time unit is). Which, I presume, would be the death knell for the boycott movement.