I have said this before and I will keep saying and suggesting it until it is implemented.

They should implement the guaranteed gear drop system that they have in leveling dungeons for level cap dungeons from previous expansions. I understand that they wouldn't have it for current level cap duties to incentivize people running it, but there's no reason not to have it for older dungeons that can be run unsynced and are only being farmed for glamour. I think this should also apply to older 24-man raids as well since glamour can be particularly aggravating to farm for there.