Why would any one in their right mind spend so much time leveling for the billionth time? We wanted leveling to be HARDER, not longer! This would allow people to level multiple toons in different regions so that it doesn't bore us to death and make people quit. Remember, what made it worth while in Vanilla was that Vanilla was the end game, we weren't thinking of the many more expansions to come...How many more levels do we need? why not stop at 120 and introduce other kinds of leveling?? This is just stupid.
Edit: Yes, you can make it harder but not longer by reducing the amount of XP needed to next level. Mobs should not die with two hits, neither should you die if you aggro more than one mob, but it shouldn't take forever. We have all been stuck with a main that we no longer liked anymore due to class changes. People wanna level all classes at some point. And no, nobody in their right mind would pay for a boost either, that is even more insane.