I've thought about this before, I wouldn't mind seeing this through. As a tank I don't like having other tanks and the swapping or secondary mobs some bosses aren't enough to justify the benefit reducing tank requirement
would bring to ques.

Except for in high risk content such as savage, should probably have 2-3 tanks for that in case some die, but then again if that happens doesn't that mean you're screwed anyways cause of enrage or whatnot, I don't raid.