So, you may be an elf lover, or just one of those people who actually just want your cherished horde or alliance free of long pointy eared players...
what if a few expansions down the line or even a WC4, this is exactly what blizzard did? It all started in Legion, when blood elves and night elves worked together and proved formidable in stopping the demons, where Alleria's returned started a process that would mend the rift between high and blood elf, and the tenacity of the highbourne was revealed to unite all the Elven peoples as one and restore the glorious days of the past.
Eventually they all gathered together - controlling western and northern Kalimdor - Feralas the most southern point, Winterspring the most northern - Capital on Hyjal, Suromar and the Southern half of the Broken Isles, a good chunk of the risen continent Azshara brought to the surface before her defeat, and Quel'thalas. Their faction allies include the Draenei, The Worgen and the Panderan, with Cenarion and Furbolg allies.
Humans Alliance - comprised of Dwarves, Humans, Gnomes, Forsaken undead and Vampires have the largest presence in the Eastern Kingdoms, with a toehold area in Kalimdors Dustswallow marsh and southern Barrens. Most of Northrend.
Horde - comprised of Orcs, Tauren, Ogres, Ethereals, - Eastern, Central and Southern Kalimdor, Highmountain and the northern 3rd of the Broken Isles, Outland continent, bits of western Northrend
Trolls - comprised of the united Troll tribes, Goblins, Tol'vir - Tanaris, Un'goro, Uldum, South Sea Islands, Southern part of Azshara's risen continent, Southern Eastern kingdoms, from Stranglethorn Vale to Swamp of Sorrows