I think you dont get it. You have 200 life in Pvp. Only 3 shots from a handgun will kill you. 1 shot from a sniper kills you. 1 shot Fusion rifle. 1 shot with a shotgun. 4 hits with a scout rifle. At what time a "healer" should throw out his heals?! With bringing a healer class into destiny you would change the whole game. Its still a FPS, with RPG elements. The idea is a good one, but in my opinion not possible.