One option that could be look at is dropping the requirement from 4 person to 2 person and 2 companions. Allow the Crown to set companions to specific rolls like Tank and Healer and 2 Human DPS's can run a daily random normal or queue up for any dungeon they want. While I know you can port in and run any dungeon you want solo or with less than 4 currently this would/could help with small team queue times.