I think you are complaining just a bit too early here. The game just came live. We don't even have a stable base or server economy yet. Destroying the leveling abilities of half the classes isn't a solution.
I think they need to adjust some of the classes/specs first. Some classes struggle with the current content. Others just blow through it way too easy.
Making a baseline leveling increase would especially hurt the casual players. You know the ones the were not playing since beta, that don't have the opportunity to play each class a little to find out which one is OP, then level it all the way up to 50 because its too easy then come on the forums and complain that is was too fast.
IMO:D