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I would wager most of nowadays instances have either fallen into obscurity or just finished existing, I think we will see instancea more focused in scalability if thr fediverse grows in popularity, whoch will kind of dominate the space.
lemmyworld might survive i think.
If I had to guess for a few I would say beehaw and lemm.ee will also still be alive in some way or another, but I dont think they will keep being as big in proportion to other instances as they are now.