I don't know if Blizzard has said anything about it specifically but it's gotten to be a pretty big problem on some realms. For example Illidan-US where the Alliance has just a 5% population there. I personally think that this screws up the game for everyone by making pvp ques incredibly long, screwing up the auction house and basically ruining the game for everyone on those realms. So, my suggestion is at a certain point to preserve some idea of faction balance is that Blizzard place a hold on anyone making any new character for whatever faction has the majority of the population until things start to balance themselves out. It's simple enough honestly and with a little vigilance on Blizzard's part i think it may work. Oh and maybe, just maybe they could offer free faction changes on those realms to help expedite the process. They really should look at closing realms too that don't have that many players on them and giving those people that are on them free transfers off to realms that are a bit more active. What do you people think?