There's that very helpful post on how beehaw defederating affects us

If my understanding from that is correct, then all the communities,posts, comments, which lemmy.world or any other servers users have subbed/interacted with are all cloned over or lemmy.world or the respective servers.

So if beehaw shuts down, their data will live on the other servers until they shut down themselves or purge the data for some reason.

Although this would only be useful for archival purposes and not useful to interact with any of the old posts, as any further changes would not be shared across the remaining servers.

This is a new town and we're all still deciding where the houses and streets should go.

What you're saying seems to be, "If this particular street doesn't happen, does that mean the whole town is just chaos and nonsense and we should all run off elsewhere?"

No, it doesn't. It doesn't even mean anyone else has to tear their house down and flounder in the dirt waiting for consensus.

It just means the people involved renegotiate things and figure something else out.

This is actually a very interesting question with regards to the fediverse IMO...