Now that was a legitimately controversial suggestion
Agreed that would be a wonderful situation to strive for, however that's also idealistic to the point of naivety to expect that out of the masses.
My point isn't solely about DPS, granted that is a fair portion of it (given that combat effectively revolves around it for the majority of this game). As I stated in an earlier discussion in this thread, the idea of using healers and tanks cooldown and oGCD usage as another metric was one that appealed to me. That's not a DPS thing, that's just good form and play. Granted it's nigh impossible to accurately reflect that in a value without some form of flaw in there.
*edit*
I'll also add, lets keep in mind that no single solution is ever going to fix the skill disparity that exists within this game. It's going to take a combination of things to help ease down the gap, and I see this as one of several things that are required. Baby steps etc.