ST already tried the extra DPS route (5 DPS in instead of 4) and it didn't really make queues any faster; every time I queued up, the long wait was always due to lack of healers and tanks. Changing the core mechanics of the battle system itself for the sake of having shorter wait times for duties is going past the forest and into a landfill. Unless Square decides to abandon the holy trinity, people are just going to have to deal with it.