Ok, the name of the title is moot, get past that and look at the idea. I like the idea about # of healers, but I am not sure why people are saying longer queues. Maybe I am just lucky and get instant queues for randoms, but I though since the change to go battlgroup wide with BG's the problem was fixed.
And there most definitely is a relationship between gear quality and win chance of teams when one has at least relentless/wrathful and the other is in deadly/furious at best.