I had a brilliant idea yesterday: locations in Destiny that are PvE but allowed you engage in PvP. Perhaps there are high reward, public missions in the area, and awards are given to the first fireteam of guardians to reach the location (with a timed reset). There can also be high risk, high reward Public Events that will make guardians second guess just killing other guardians they encounter in this area. I am imaging wide open spaces with the occasional derelict building. The close quarters would be really interesting if players were allowed to do a proximity chat, as it could allow players to talk safely and perhaps join forces into a fire team... or trick each other. Anyways, that's my idea. Feel free to share your opinions or add to the idea!