Not for AF quests, these need to be accessible to everyone. I don't even think Aurum Vale should have had a requirement since it's an extra step for any newer players that only have PLD, BLM, or DRG that other jobs don't have to take.

I think it would be cool if in the future older dungeons had special drops or what-have-you added to them that would activate side areas/harder versions in newer content, while leaving the dungeon itself accessible without too much prerequisites, so you could cater to all types of players, although forthcoming difficulty modes will probably accomplish that anyway.