I love the idea of a healer subclass, but it would only work if two things changed about Destiny. 1: We would need more health. Sure, we have more health than say a game like CoD, but we don't have the gaping health pools of a traditional MMO character. In games like WoW, TERA, SWTOR, or Guild Wars, both players and enemies have huge amounts of health, and battles can last quite some time. This benefits the healer because they have more time to recognize when a player is near death, get to them, and pop the heal. I personally don't think there'd really be enough time for this in a Destiny firefight. 2: We would need a better way of seeing teammates' remaining health. Currently we only have the tiny "!" That pops up next to an ally's name to show us that they're in danger. Most MMOs handle this quite easily by allowing anyone in a group to see every ally's health bar on the side of the screen. If Bungie were to add this they could even display the super bar status underneath the health bar. I could be wrong about either of these things, but in my opinion at least the second option should be added if a healer class is to be implemented.