Originally Posted by
Preypacer
Actually, Yoshi-P has discussed that very issue. There's a translation/summary of info in a thread around here (I'd need to find it), but he specifically says they're considering two options for the possibility of a zone reaching maximum capacity (which seems to be 1000 people). One option is a lock-out, the other is to have a new instance of the zone created for people to go into instead.
As he doesn't anticipate having 1000 people in the same zone as a "normal" thing, they're not sure which would be the best way to go about it and are mulling it over.
So, the OP is bringing up a valid topic. It's a big "what if", but it's something that they still need to account for because it could happen.
Edit: Endigiont found the bit I was referring to. Woo!