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So many people like to speculate which soon to be released MMO will be the death knell for WoW. It's been going on for a couple years now and many games have come and gone and still WoW remains on top. Games will continue to be released in the future. Will AoC be a WoW killer, will WAR? Most likely neither of them will be.
So instead of asking which game that is currently in development might do it, let me ask something a little different. What kind of game would it take to kill WoW? Or better yet, is there a formula that could be more popular than the WoW formula. Perhaps there is none. Perhaps WoW is the most successful formula there is and therefore, we are destined to see WoWish type games made again and again and again.
I personally don't care if WoW lives or dies. I don't care if it continues to rule or eventually gets dethroned. I guess I'm just asking a familiar question with a slightly different spin because I'm a glutton for punishment.