I'd be content if they made more boss fights similar to Magus Sisters difficulty. Tri-Disaster is a pretty fun mechanic for a dungeon. It's chaotic and requires you to pay attention (since you can KO pretty easily if you get hit by everything, especially during Blizzard Disaster), but still clearable for those who don't do raids at all.

I'd also like the 24man raids to be... not like Myths of the Realm are right now (easier than Magus Sisters and Zodiark).