I hate to be the bearer of bad news, but if the Alliance gets High Elves, well, they would have essentially two blood elf races as opposed to the Horde's one. Say the Alliance gets them, well to balance it out, the Horde should get the San'layn. Horde gets vampire undead elves, light elves, and arcane elves. The Alliance would have Silver Covanant/Ranger elves, void-y elves, and druid elves.