2014 will likely be a good year for WoW as the release of WoD will bring back a lot of people.
Or a properly designed f2p model. So far on the Western market f2p has been for mini budget indie games and big budget games that failed as subs but in Asia Age of Wushu has already overtaken WoW with a f2p model.
A f2p model that's designed properly and integrated with the game from the start should work a lot better than converting a sub game. I think it's strange how WoW has reigned in MMOs when the rest of the internet is a story of free services trampling over sub models (think Youtube, Google, Twitter, Facebook etc, all these had sub fee competition which failed miserably).