I honestly don't think twitter will ever go away until all of a majority of all major sports teams and leagues, a majority of legislative body members, and major news and wire services have a sustained and active presence on bsky. it right now is literally coasting on everything that made it useful pre 2022 and every stupid fucking thing elon has done to make the twitter experience worse hasn't done enough to cause a critical mass of people to jump.

once you see major popular twitter accounts like rex chapman, mark hamill, taylor swift and the like (and I say this not because of their politics but because of their massive follower base) regularly post on bsky you can probably start closing the book on twitter.