the BELFs and Draenei were the developers' first attempt to equalize the disparity in faction character size.
Compare gnomes dwarves and humans, vs taurens orcs and trolls. When you and all your friends are bigger and meaner looking you feel more confident, and when you and your friends are smaller and harmless looking you feel less confident.
The main reason to be a puny BELF was to play as a paladin. Now the hord get HUGE paladins. Way to undermine the equalization blizzard. Not cool.
But the alliance is getting some fierce looking worgens, and the horde get puny tiny little things, goblins.
Let's keep it along those lines until pvp evens out.
Oh and nerf BELF racials while your at it. Also keep the extra long pvp queues for the hord; pvp ez-mode should have a price.