I would argue the Horde needs a good Alliance story almost as much if not MORE than the Alliance, because otherwise there is no where for the Horde to direct their aggression against the alliance. At least the Alliance has Garrosh, and if thrall comes back, Sylvanas, to really get them fired up about killing some horde. Horde looks at alliance leaders and are like... why do I care about you again?

A good Alliance story is not just good for the Alliance, but something that I think is necessary for the entire health of the game including both factions.

I really really wish they would make a Warcraft 4, they can develop heroes so much better in a RTS or RTS/RPG, I mean just look at Starcraft 2 - you, the player, develop intimate relationships with all the major heroes, and in turn you are rewarded with an epic story and excellent character development. I just have a hard time believing that blizzard can give it's playerbase the same connection with it's heroes without another single player campaign-type game.