Low level dungeons are set up with the expectation that half of all players want to dps and a quarter of players want to tank. Queue times make it obvious that's not true. I think a good solution would be to change light party dungeons from 4-man to 5-man. It probably won't give every data center insta-queues but it will help with the wait times. SE could beef up the difficulty to accommodate 3 dps, 1 tank, and 1 healer in a low level dungeon. It's not exactly a miracle solution, but I think it will improve quality of life without having to make any radical changes.