Do you think Blizzard will be able to balance factions if TBC comes out?

Private servers had the advantage with the project effectively only having one server. Since there is bizarrely (to me at least) a natural 50/50 balance for leanings towards horde and alliance, having a community with only one choice forces extremely good balance. With multiple servers and bad server management with server transfers as we got in early classic days, it seems that the natural state is an imbalance. It's a shame because I would think that there could be ways to cleverly fix faction balance but it's never seemed high on Blizzard's priority list.