Rather than quit the game, if healers don't change in 7.0, I'll probably just not level them anymore, not even for the role quest. I'll clog up the duty finder with more DPS. In fact, I'll put in requests to be able to clear the role quest as a DPS since healing isn't fun.

And I recommend anyone unhappy with 7.0 changes when they come around do the same. If nothing changes, then just cloud up the suggestions tab in-game with requests to clear the healer role quest as a DPS instead for a more fun and engaging experience.