Getting rid of leveling would not be enough. Other people would demand max level chars that are geared out with epics when you create them. And that would not be enough. Others would want to be able to one-shot the final boss of the expac solo. THAT is where they want to be. At least for 5 minutes. Then they will complain WoW is boring and quit.
Hey, the core of an RPG is using fun skills and spells to kill things. Leveling is a mechanic that provides you a reason to do it. The end. If you hate that, you certainly hate the RPG part of it all.