OK. If Blizz allows the Alli to roll Helves/Belves that would give alliance players access to 7 races; Humans, gnomes, night elves, draenei, dwarves, worgen, and high/blood elves.
The Horde would only have 6; Orc, troll, tauren, forsaken, goblin, and belf. That kind of difference wouldn't be very popular among players, so Blizz would have to give the Horde access to a 7th race, in the spirit of fairness and to prevent fanboy mobs from burning down GC's palatial estate.
The problem there is that if the horde got Ogre as that 7th race (prolly the most logical option), then the alli fanboys would freak out that the horde got a "new" race while the alli got stuck with a palette-swap horde recycle, and GC's decadent mansion would still go up in furious fan-boy mob-flames.
Blizz is in a damned if they do, damned if they don't situation vis a vis alli Highelves unless they specifically give horde a palette-swap alli race, so that each side can grumble and mope equally.