Deleveling is probably the dumbest feature I've come across in an mmo. Difficulty? How the hell does that increase difficulty? It only serves to make content repetitive and boring. Not to mention there can be plenty of factors to someone dying. Connection going out, bad party, trolls etc.

You want a challenge then request ACTUAL content, like a tougher dungeon. THINK. Give the devs original ideas rather than something that has been done and failed. There's a reason why that feature isn't seen in a lot of mmos.