As cool as that could be, it’s a tad unrealistic when racials are considered. Half Elves could stand on their own as they’re one of the few half breeds that’re known to exist, although Blizz could be cheeky and throw in a purple skin tone as representation of those that’re Half Night Elves
Pair them with the other half breeds, the Mok’nathal, and there’s the Horde equivelent of playable Ogres. Two iconic races that are throwbacks to the RTS days of warcraft that I’m sure would be huge successes if done properly