I think the Fediverse will be popular. It’s already being adopted by Meta in the way of Threads.

Popularity comes when major companies, like Meta, push for something to be in the mainstream. Will Lemmy be popular and be pushed for the mainstream? Probably not. The mindset of the majority of the admins is against streamlining it. It’s why we have a bunch of instances and why so many of them defederated from Threads (which I agree with). They’ve even taken steps to stop having so many people default to the .world instance in an attempt to diversify it.