Would you run daily challenge dungeons?

[Sylve]

I wouldn't be adverse to extreme dungeons. Drops could be identical to normal version but with more materia slots as suggested.

It's about time we had access to more challenging 4 person content.

I've suggested before an EX version of Dungeons. Use a reverse ilvl sync (Syncing the Dungeon to the parties ilvl) and drop Aetherial gear around the quality of Alliance gear. Say, 5 less ilvl, more materia slots for customization.
That way you can scale such difficult content to the gear of the party so it always remains a challenge through an entire expansion.