In every other game I have played since UO where dps/healing numbers have been used to justify calls for nerfs and buffs it has led to homogenisation of classes. You might as well bin the different classes and go for:
Tank Class, Ranged DPS Class, Melee DPS Class and Healer.
People need to get their heads out of DPS meters. As long as players are putting the same amount of effort in and are not being carried so what if class X does 10% more DPS than class Y in instances as long as the bosses drop then all is good. On landscape mobs the difference between classes is even less relevant.
It is difficult to free fools from the chains they revere.
Voltaire