You know its quite a uniquely funny position that Blizzard are in from the point of creative game development. No game ever made before has been such a financial success over such a long time as wow has been.
Even todays announcement that possibly indicates subscriptions are plateauing or possibly in decline still doesnt mean that Blizzards isn't going to continue to make absolutley bucketloads of cash from it for years to come.
You wonder how the game designers that worked on the game over the last 7 years feel about the ongoing amazing financial success of the game - obviously they put their hearts and souls into it and produced one of the most fantastic games of all time but as anyone who has ever worked creatively knows there is a time and place where you should always move on to the next project and put your old one up on the shelf.
I am really excited about whatever Titan is going to be - with blizzards track record Im sure it will be amazing but I wonder if the real leading creative lights at Blizzard at some stage will actually prefer World of Warcraft to die so it becomes another historical jewel in the crown of Blizzard alongside Starcraft 1 Warcraft 2 Diablo etc and not stick around outdated and ugly alongside whatever new and amazing thing they come up with in the future merely because it continues to pump out rivers of gold for Activision.