It means we would be able to see and follow profiles on Bluesky, and they would be able to see and follow profiles on Nostr. In theory we would not need a bluesky account ourselves, which is how I've seen it work with Mastadon and other services on the Federated network. Basically it would be a 'giant sucking sound' as people realize that Nostr posting is so much better and that all social media roads lead to Nostr.