The DPS classes in World of Warcraft present us with a conundrum. If we consider the holy trinity of tanking, damage dealing and healing to be a pyramid that the game relies on, then the base of the pyramid is most easily envisioned as cornered by the tanking and healing classes and the apex occupied by the DPSers. The issue is, only four classes can hold up the tanking corner, only four can hold up the healing corner (and two of those classes are also in the tanking corner), and absolutely every single class in the game can stand on the top of the pyramid. This results in a pyramid that's metaphorically heavier on top than at the bottom.
Furthermore, of the game's 10 classes, four of them (the rogue, mage, warlock, and hunter) can only stand at the top. Whether or not they want to do something else is immaterial (although one assumes that they do not, elsewise they might have chosen a different class), because they simply cannot do so -- at least if we continue to visualize the game as based around the tanking/damaging/healing triad. So what to do?
Well, we can get rid of DPS classes entirely.