This is sort of an opposite idea to my other thread. "Why not let all classes tank"
Sure, I know there are reasons why all classes have a DPS spec and I'll throw up the best and most obvious one first. To remove DPS classes from hybrid classes would slow Questing down to a dull, boring and hugely time consuming chore. But is there a way to fix that? Prot Warriors can quest ok, healing specs would need more DPS, adding reactive damage like inflicting more damage upon being hit could speed up questing DPS while not making them viable group/raid DPS. There might be ways to keep them fun.
The reason I suggest this is because as we all know it's harder (there fore slower) to find a spot in a group or raid as DPS because there are so many DPS'ers out there.
Thoughts?