And if we go by...
https://www.statista.com/statistics/...cters-by-race/
We have 2 options. 1: A 'human' like race. Which wouldn't work because we know Orcs really, REALLY hate them. And Blood elves kinda do, too. 2: A 'night elf' like race, and we know no night-elves will join the Horde because of the.. well.. orcs and they way they treat Ashenvale and such. And don't even get me started on the Nightborne for the Horde (even if it would make most sense because they and blood elves can at least relate to one another), you KNOW the Alliance will NOT BE OKAY WITH THAT! o_o
So, yeah. Not gonna happen.