Personally, I am fine with 1 dungeon per patch, however, what does bother me is the lack of variety in Expert. I would be fine having just the 1 max level roulette and putting all the max level dungeons in it without taking any out. Obviously, the downside is losing out on a roulette, however, tomes are easy to cap each week anyway so I don't see this being an issue.

This will stop Expert feeling like, oh god, not this dungeon again and more, oo, I haven't done this dungeon in a while. Yes, they are all long corridors, however, the atmosphere helps to keep each run fresh, especially if the dungeon pool is higher, so you are more likely to get different dungeons each time.