The Fediverse will grow. Especially, with Threads joining and potentially Tumblr and Post.news. You’re right that the Fediverse we know will disappear. I believe there will and needs to be a great schism. You have strong actions of Lemmy and Mastodon that are anti Threads and anti growth, let’s call them small fedi. Then you have those that will federate with Threads and want the Open Social Web to become the major focus and how most people engage socially online, big fedi. You already have a culture with a lot of infighting and some fundamental incompatibilities, it will only get stronger. It’s best to separate now.