If nothing else, Bluesky will serve as a quality filter for the fediverse in the same way Truth Social has.
Celebrities are largely dumb and need a platform that holds their hand, and they found fedi too confusing.
Since Bluesky aims to be a Twitter clone where the federation is a technical thing in the background rather than something they're forced to understand, they find it easier and will migrate there, leaving fedi's culture to continue as it has been
It's basically a fedi alternative, so anyone can spin up their own bluesky server.