I have a very easy solution to all of the problems with tank and healer shortages for 5 mans. Make emblems BoA. That simple. I would probably just tank non-stop to farm my emblems. Perhaps I would change it up once in a while, but I would mainly do it on Darraxus.
I love tanking. It is much more fun when there is actually some kind of payoff.....such as being able to gear your alts without them having to scrub it up. People would play their mains more, which means more competent and better geared toons in out Random LFG.
I am in you instances, getting all of you emblems. Please lets me send then where I would like. Seriously. I would send all of the frost to my Warrior. I would send the Triumph to my alts.....WIN WIN.
5 mans are one of my favorite parts of the game.....however, I generally don't care to run them unless there is some kind of incentive for it.
A Tank who would always tank if you made it worth my while.