How much more is there to be done in terms of Lore and exploration.
Obviously Cataclysm will use up 2 years so that makes it 2012. What comes after that? Southrend? Emerald Dream?
Do the Naaru take the fight to Sargeras? More Old Gods making an appearance from somewhere?
Will players crack level 100? Will there be a wow killer soon? No one else seems to have the resources to compete on the scale of WOW, it seems.
Will Blizzards new but yet to be announced game cause a mass exodus that will deplete numbers? Or will it be an entirely separate genre?
In terms of a market cycle, WOW is still a cash cow but that can only go on for so long. They will need a new game to excite people. Or will they? Is the only Blizzard competition Blizzard itself?