I have been more pushed levelling astro than I have any other classes in dungeons, I have also played a lot of MMO's and usually there is some wacky mischief that you can pull like no healer runs. I think there is a bit of confusion here with my point on dungeons . Dungeons being part of the MSQ SHOULD be the lowest common denominator for difficulty which they are and that means at that difficulty they should be essentially role agnostic if the players are good enough . but the community has responded by just saying ' Well I'll wall to wall then ' so there is a very difficult balance now you can
A) up the difficulty of all packs disallowing wall to walls from now on and the forums explode from that one decision.
B) Balance damage for the very best tanks to still be able to wall to wall but your average tank being unable to but culturally it will still be the standard because if Xeems can do it so can I will lead to the absolute curse of getting that one awful gun-breaker who was carried by a god tier white mage that one time.
c) remove all self heal skills from tanks , making them essentially shit dps with rampart seeing as they've already removed emnity
D) increase the difficulty of Dps rotations where you get the inevitable backlash of ' Im a healer not a dps'

I think the real solution is keep leveling dungeons as they are but normalize a higher level of play required in anything outside of the MSQ.which they've kind of already said they are doing.