Personally I liked the random dungeon finder in WoW(made parties for gear easier). Considering SE doesn't want to just copy/paste things from other games this would be a great time to build on that kind of feature while minimizing the cons that associate with it. The system would need to check users for optimal rank and optimal class gear equipped. To prevent a gimped lv50 GLA from entering with some lv50 mage armor(for example). While I could come up with more issues it would be pointless. The system is still being drastically changed so it's difficult to speculate and come up with ideas not knowing how these new/upgraded systems will be in the future.

Good Luck Yoshi-P and team you have a shitstorm at a garbage dump to clean up.