Considering that I am a mana-god (WHM :P ) and the fact that mobs hit like wet noodles with serious self esteem issues.

Erm... I can heal them until the 90 Minute timer expires.

So, yes: there is absolutely -0- feedback in the game for DPS to "up their game if they want them lootz™". They just get dragged along by the collar if necessary.
Unless they enter extreme or savage. Then they get hit by a brick wall of difficulty, because apparently the DEVs of MMOs are incapable of using the vast territory of difficulties that lie in between the two extremes. <_<