Square, please make dungeons 5 players.
While the player base for FFXIV has been somewhat solidified in who enjoys playing as a Tank, Healer or DPS, the issue with DPS queues into content is only exacerbated by the influx of players wanting to leveling Red Mage and Samurai.
http://livedoor.blogimg.jp/tekitou_m...810b43c8-s.jpg
This was photo was taken from the offical 2016 Eorzean census showing that over half the players of FFXIV play DPS mains.
My suggestion moving forward, implement dungeons around a 5-player meta; it can be the standard Tank/Healer/Two DPS and a +1. This way all roles are covered, and the queue is constantly pulling the +1 from the player that has been waiting the longest no matter what role they play.