Actually they DO need to do this at some point. A gauntlet on the way OUT of an instance with like the place falling down around you or flames/water moving in to kill you if you don't go at full pelt, mechanics tweaked so you can't just die and complete/stone out (leave a boss after it or something).
As a tank or melee dps i'd be all over that, it would be proper epic, dunno how the casters would get on with it tho.