Arguably it's probably still not ready - I have heard rumours that running a kbin instance is still much more complicated than Lemmy, and that moderation tools are still somewhat lacking. Which probably explains why there are currently more Lemmy instances out there than kbin.
The confusing thing is that despite this, kbin.social seems spectacularly well moderated at the mement. I guess that's partly because ernest is a champion, and partly because it didn't have to deal with the same insane influx of users that Lemmy has.
Still - I think the slow growth model benefits kbin quite nicely, and with federation it doesn't really matter to the feasibility of the platform whether people are here or on Lemmy. :)