** Fun idea thread, do not take this too seriously **
We all know the possibility of splitting/adding new factions is low, but I think it's fun to discuss nonetheless. For the sake of the thread, let's assume 3rd faction has systems in place to work for gameplay, like PVP/Raids/WorldPVP etc.
So let's assume Sylvanas splits off from the Horde and goes on her own path, giving an option to leave the Horde (and maybe Alliance) to join her.
Would you join her on her crusade?
-Edit- Emphasizing the bolded part.