I would like to see something kind of like WoW's mythic system. Was a lot more fun than I thought (considering I only ever go back to WoW every so often and play for like a month and get bored) and sure made everything feel new compared to the previous years. Having something like that in FFXIV would be nice and a good change of pace but to be at the same level or more than savage is up in the air.

HoH I believe was considered to be savage difficulty with 30+ but the weapon isn't the same ilevel (least I don't think).

What people seem to forget is that Yoshi-P (I need to go through the live letters again) said he doesn't want to do much with high end difficulty with only four players simply because if the healer drops, you lose where as with 8 people you have a better chance of coming back from mistakes. I wouldn't point at Rath though cause it doesn't have any sort of tank aggro or heavy mechanics you need to worry about other than dodge and stack. Trying to apply that sort of thing to something like Savage or Ultimate would probably just cause more problems.