This may be the wrong forum, but it relates closest to dungeon queues, so I'll put it here.
DPS queues are ridiculous. It takes up to an hour to get into a dungeon unless you're already in a party with a healer or a tank.
If you added a fourth role, Support, and relocated a few classes/jobs from the DPS queue to there, it would shorten the wait big time.
Before anyone gets defensive, which they inevitably will anyway...
You don't need to change any abilities or anything of the like.
Just create another dungeon queue for a few classes/jobs.
Bard, Summoner, Arcanist are three I can think of for Support roles.
Again. Play them the same. Keep all abilities and play styles the same.
Don't change the characters at all.
Simply creating another queue in and of itself will nearly half all currently categorized DPS players' wait times for dungeons.
Support roles will actually have a shorter queue, being that more classes/jobs will still fit into the DPS category.