If anything, Cataclysm would make them more reluctant to ever do a revamp. It's reception (while I enjoyed it!) wasn't exactly stellar, and it turned the leveling experience into a continuity nightmare that will never be resolved. The fact that they let that nightmare exist, however, is telling in and of itself. They don't care about continuity as much as some of the players do. They only care about what is "on screen" right now. The only game is the endgame, as they say.