Isn't having multiple communities instead of a default one a strength instead of a potential issue? Like, sure, if you're personally following more than one you'll likely end up running across repeating posts, but should one of them become a problem in any way the users can just abandon it for one of the others. Kinda like what happened with r/curatedtumblr, but the "new" option has been there all along. Plus, some will naturally prefer sticking to the smaller ones.

Plus, communities like these need quantity as much as quality to thrive. Each wave of Reddit expats makes this place better and more attractive to the next one, rinse and repeat. There'll be another exodus when the TPAs officially die, most likely bigger than this one since it'll hit in a more personal way. And then there'll be more after that, because we both know Reddit isn't gonna stop digging its own grave anytime soon.