Honestly we'd better picking another main instance from scratch. lemmy.ml is federated with a cesspool of russian shills (lemmygrad) and we don't need this, we really don't need them. Nevermind how many people can register on our new instance, more redditors can start new instances as time goes one and still connect to the communities (subs) on our new one. In a way we don't completely escape federation.
The bonus is that if the admins of the new instance go reddit-crazy, we always have the possibility of picking another instance as the main one.
I read strange stuff about beehaw, the admin going primadonna or somethin'...