This sucks, and might be the reason I return to Reddit. This pretty much splits the Lemmy population in two halves
Not really, I'm sure there are other Lemmy instances that have access to both. I'm on kbin for example and can see and interact with lemmy.world, beehaw.org, and sh.itjust.works.
Yeah, but at the moment, beehaw, ml, world and shitjustworks are the 4 biggest lemmy servers. Now, beehaw and ml will stay on the beehaw communities, while world and shotjustworks will have to split out into new ones
AFAIK this isn't a permanent thing, they just need to catch up on how they're going to mod it all so if they get some more mods or better modding tools they sound like they're willing to federate again.
It's permanent to me. I'm not going to put the work in to contribute to communities that have shown they'll just cut you off arbitrarily.