I think that just based on the properties of the network/graph, it's unlikely that enough important accounts will leave, and therefore people who are interested

I think that just based on the properties of the network/graph, it's unlikely that enough important accounts will leave, and therefore people who are interested in them can't leave. Anyone who's built a good audience is unlikely to want the platform to die, that's a big risk to them. Some people are just famous in general, and they might have an easier time migrating to new platforms and have people following them, but still, why give up all your followers? You see people like Yann LeCun announcing his leaving. Then he comes back and posts "teasers" of his Threads posts, and he's retweeting posts showing that he's still active. And this guy works for a competing social network! Maybe this time is different, the left's hate for Musk runs deep now, but my bet is X will be fine in the end.