It would be easy to dissuade camping. Simply make a debuff that slows your movement speed the longer you stay in an area past a certain time limit. Or change trials from slayer to a randomly moving king of the hill. That being said, I'm sure Bungie would duck it up somehow, "hey guys, we decided trials matchmaking wasn't quite where we wanted it, so instead we made it so that the algorithm takes into account the physical distance from your actual console to the real life planet the map takes place on. Naturally this distance is divided by 7 in order to assign you to a competition bracket in order to improve the competitiveness of your matches as well as your connectivity to actual aliens."