That would be fucking horrible.
While Brewmaster and Blood need some work (esp Brew) it has more to do with the extreme learning curve for tanks in these runs. It's a lot of responsibility, research and practice that most people don't want to deal with. Healers have the hardest overall job for sure but that upstart as a tank is very intimidating. Make any mistakes, overestimate your group, underestimate your group, etc, you're going to get royally bitched out in a PUG.