This is like beating a dead horse, it's a big major problem, and huge lack of incentives. A year and a half later, even after duty roulette, the problem still exits and it will be getting worse. There will be short term relief with the expansion, you should be able to have more tanks and healer for below lvl 60w, but I doubt it will last more than 3-6 months long, then it will become a huge problem again.