I'm more talking about the internal story of the game and not its playerbase, though. The players are never going to stop carping, complaining, or griping about favoritism in one direction or the other until neither faction exists or the game essentially ends - this is just how it will be, it's a product of the human instinct to identify with their own group or tribe. I'm also just as curious as you to how such a peace could come about, but I imagine from what I've seen so far that it will be a matter of costs so injurious to both the Horde and the Alliance that they can no longer continue the conflict. The medieval fantasy of mutually assured destruction, if you will. The Alliance and Horde both losing the will to keep fighting, and the neutralization of the firebrands who promote the fighting (e.g. Sylvanas, Genn, etc.) for reasons of their own.