Could snip it down to 5 roulettes

Lv70 dungeons
Lv15-69 dungeons
Trials
Frontlines
Mentor

Main scenario would have to be merged into Trials because it's 8-player which is why those two dungeons were separated from all other dungeon roulettes. Eh, so hard to fit them anywhere. If we can get squadron AI ready for castrum and praetorum, we can finally let people clear them with NPC help and remove them from any roulettes.