A lot of clueless users will get on Threads and attract attention to it. Then governments, public institutions and other organizations will join it too due to the attention. Open fediverse users will protest against their choice of Threads, but will be pushed back, citing the federated nature of threads. Finally without any recourse, open fediverse users will start following these Threads accounts for important updates. And then fine morning, meta will announce that they're cutting the federation due to 'spam from the open fediverse'. And the open fediverse users will be left high and dry without updates from these important accounts. Many will resist it and stay on the fediverse. But a huge population without such strong moral stances, will abandon the fediverse and move to Threads to retain their access to the important updates. And the fediverse will become a shadow of its former self. The end!