> Twitter and Facebook will still be around, Bluesky will be no more, Mastodon will continue to be niche

I'd be curious to know if you have an expectation for what will cause your cited Bluesky death. About 6 months ago I would have probably backed a prediction of "will remain niche" for it just like your Mastodon one, but now I am following some relatively big name accounts that have migrated over. And I undoubtedly enjoy the experience a lot more than X