EDIT: Just crossed 26000!
Almost! At the time of this post, lemmy.world has a whopping 25733 users and is growing fast.
Since my last post yesterday, it has added 4000 new users, making it the clear second-largest lemmy instance out there. Also quickly catching up to lemmy.ml's 36000 (not taking new signups).
beehaw.org (3rd largest) sits at 12500 users, partly because of more restrictive registration requirements.
Source: https://lemmy.fediverse.observer/list
Exciting to see all this growth!
There's already kind of a "tumbler" at https://join-lemmy.org/instances. It confused the hell out of me the first time I tried to get on lemmy.
I get your point, but I also do see the benefit of a stable, default landing place (like lemmy.world is shaping up to be) before people start spreading out. Personally, I joined lemmy.world because it had a lot more content on its main page compared to the other instances (I also have accounts on other instances too).