I think the majority of players like to play humans, so the only ones that will be considered as such as Humans and Cassians. I think to a large extent this will balance out the disparity of "players who want to play a human-like character." You can see from the WoW stats, the real jumps in population are around humans and blood elves, as they are the most humanoid of either faction with a night elf as a close second. I think it moreso depends on how they make the dominion and exiles sound, because some players like to be the good guy, and on the face of the game the exiles come off as the good guys and the dominion as the bad. It doesn't matter if you find out that exiles aren't really the "good underdogs" until a few levels into the game, because at that point the player is already invested in their character. It needs to be evident at the character select screen. I think either faction has a good distribution for player personality. Both sides have a "cute" race, both have an oversized hulking race, both have the kind of race that you sort of look at and go "ew..." and both have a straight up human. So, the most important thing for the faction balance at that point would be to convince players that both factions are both good and bad for certain reasons.