I think there will be fork and there will be fork. A company like Samsung will continue to take what Google churns out, put their more proprietal stuff on it, and ship it. Probably not as Tyzen any more but who knows. I suspect a FOSS fork will never go back to Google after the last version that didn't require this dev register check. They will find a way to maintain feature parity with it but it will be delayed.

Forks haven't worked that well for Samsung Tyzen or Amazon because they never gained enough users, nor probably contributed they enough to the bottom line given the investment. It remains to be seen whether the more privacy conscious people can move the needle enough for a FOSS version.