I remember trying to explain that to one of my friends, who plays World of Warcraft. I was talking about how there'll never be a Warcraft 4, because in order to make it they would have to cease production of World of Warcraft, and let's face it, they're getting far too rich off of it. She countered by saying that they wouldn't have to, they could just adapt WoW to fit the new strategy game's storyline.
I then went about explaining in some detail how story is irrelevant in World of Warcraft (read: any MMORPG). For example, Illidan Stormrage, an epic villainhero who really deserved a good death scene in a proper game. Instead, you have hundreds of people killing him, dozens of times. It's a shame, too, because the Warcraft games have some of the best story I've seen, behind Halo.
Anyway, OT, glad to see Yahtzee agrees with me, and I look forward to Mogworld. Should be interesting, at the very least.