Yea, I had a thought related to this (posted already on Mastodon: https://hachyderm.io/@maegul/110093240178204572) ... which boiled down to wondering if the fediverse is a solution to an old or superseded problem.
If AI is extracting value from everything we "work" to put on the internet, and it is going to invade the internet, then non-profit decentralised social media helps solve the problem(s) of private big-corp control of the internet, but, probably suits the new AI industry just fine.
If true (and I'm inclined to think there is truth to the above), then I'm inclined to agree with you. There may now be arguments for opting out entirely from participating public internet social media.
The alternative would be proper online communities (as distinct from social media), where I would propose the difference is walls and gate keeping. Nothing is public, as in the case of social media. Instead, content/communication etc is available only to the regulated membership of the community. If you want to post a public blog post advertising what you think or know ... go for it. But it might make philosophical sense to start valuing cordoned off "humans only" spaces.
Against this AI moment and what may be coming, a decentralised replication of 10yr old social media platforms might just be a bit too passe in terms of what "taking back the internet" really requires, unfortunately.
On the other hand, maybe I'm just grumpy. And maybe the fediverse can easily adapt ... I'm not sure would could be done though apart from somehow embracing encryption like matrix and working hard to gate keep membership (somewhat how lemmy does it).