You could just add 2 new races rather than replacing the old ones? O.o
^That. Plus, Tauren and Trolls and both extremely important parts of the Horde. If any Horde should ever be removed, it's the Forsaken. That's based on lore fact, not bias. On Alliance side, Night Elves are most likely to leave the Alliance. They should have never been there to begin with. They're a secluded race that like to keep to themselves. That's the way they've always been and they should have never joined the Alliance. Not to mention they live in Kalimdor while the Allies are mostly based in EK, an entire ocean away. Doesn't make sense.