For the record, somehow the 1600+ players self-organized to go to the experienced room a couple of days back (numerous crashes trying to start 30-player games had something to do with it.) That was some of the most fun I've had so far with ZK, the game size was great (4v4) and very competitive.
It is a real problem though, and will only get worse as ZK gets more popular, as it seems to have been lately (conspiracy theories that all nubs are just Licho trolling notwithstanding). As the frequency of games crashing due to too many players, and bad splits increases, I think the general lack of motivation to self-segregate by ELO will evaporate. Forcing it would be a terrible idea though, how are new players supposed to learn? Being able to play alongside good players and learn by example and doing is one of the great features of ZK and its community; I would hope that we wouldn't see that go for good.