The problem is that none of the alternatives seem set up to handle it all, and that's fracturing people unsure where to go for their feeds. Like I don't trust that Mastodon won't just crash and be down for 24 hours.
The biggest benefit of Twitter has always been that basically everyone is there. It's the social media equivalent of everyone chatting in the town square. But with that burning to the ground, all these other places are like their own pubs. They're going to become their own echo chambers as people self-select which one to focus on.