I think it would be interesting to implement an fc/premade 4 man dungeon with multiple floors set up in the same fashion as coil/alex. As in clearing one floor in order to progress to the next, with a weekly reset.

I think this would provide a popular alternative for non progession/casual players as far as end game content. I think there are a lot of players that fall between casual and hardcore that are stuck waiting for guides/echo before attempting raids and this would be a great aspect to implement to satisfy those players.