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There is nothing on the market or coming on the market in the near future that will be the 'WoW killer'.
It's a popular phrase, it's a term of endearment I understand, but I amongst others have said this time and time again;
The only thing that will be a WoW killer will be Blizzard with their next MMO.
I've never been so certain of anything before, nor have I ever professed to be.
This is a fact.