Beehaw is the next-largest Lemmy instance after lemmy.ml. They’ve already defederated themselves from lemmygrad.ml for ~10 months
The best thing that Hexbear can do is act as the stick to Dessalines’ carrot and crucify r/neoliberal type users on sight (and use relative kid gloves with generic libs). That and probably brigade the shit out of minor instances trying to neoliberalize lemmy.
We just don’t have a culture for maintaining a larger community. Perhaps we will develop one, but there’s no need to plan for something so unlikely so far in advance.
I’m thinking of treating it like reddit, roll accounts on there no matter and try to prod people into seeing, eventually get them going over here. The curious ones will bring themselves over since there’s no heavy-handed lib censorship issues here nor on lemmygrad.