Instead of having a gear requirement to get into a dungeon via dungeon finder, if you want to unlock a dungeon you should have to do a single player scenario where you have to do x amount of dps, heal a certain amount, or survive for x amount of time while dodging enemy aoes (if you get hit 3 times you have to start over), sort of like a mini boot camp. This way, if people want to run a dungeon they can at least perform at a minimum level for the dungeon.