I don’t like the clickbait title at all – Mastodon’s clearly going to survive, at least for the forseeable future, and it wouldn’t surprise me if it outlives Xitter.
Still, Mastodon is struggling; most of the people who checkd it out in the November 2022 surge (or the smaller June 2023 surge) didn’t stick around, and numbers have been steadily declining for the last year. The author makes some good points, and some of the comments are excellent.
Yeah, right now the way I think of it is that Bluesky is (conceptualy) a single big instance, connected to the rest of the ActivityPub fediverse via Bridgy Fed (which speaks both AT and ActivityPub). Bluesky’s decentralized in a different way, and the broader ATmosphere (apps that use AT protocol) is growing as well, but it deosn’t really have the same concept of instance.