Originally Posted by
Pathfinder
I suppose it really depends if you want the mod to be a 'Horde versus Alliance' focused one, at least in terms of playable factions. If so, you could indeed fit the minor Horde-Alliance factions, but there would be little room for any other races. Centaur, quilboar, worgen, furbolg, ogres etc. may not be very united but are regional powers with much more punch than the high elves or Stromgarde. Factions like the Argent Dawn, or Twilight's Hammer cult may even be more important.
Don't get me wrong, I'd love to see them all as factions - the problem is they can't all be.
In your list you have combined the Dark Horde factions, as well as the goblin cartels - I still think this is the best way to go, but if you want a 'WoW playable race' focus then I can understand. As you said, you can't please everyone.
And I don't want to nitpick, but at the start of WoW Dalaran is still an Alliance faction and at war with the forsaken. They are Alliance in the RPG too. I don't think they ever left, just put aside the war for WotLK.