Duty Roulette: Raids

[Exodus-E]

I'd separate the Coils (8-player party) from the CT (24-player party) raids, IMO.

It's already hard (read: near impossible) to queue into CT raids as it is, and introducing a "general"
Duty Roulette: Raids would make matters worse (because the Coil would be the most likely thing to come up, considering it needs less players).
Similar as to how Duty Roulette: Guildhests works (the last Guildhest, which needs a FULL party instead of a LIGHT party, almost never comes up making it difficult to queue for).

If anything, I'd expand on your idea and create both, a Duty Roulette: Crystal Tower and Duty Roulette: Coil of Bahamut.