We work with a tank squad. Most of us have a melee dps specc (or are able to do even more: our druid can tank, kitty dps with the best of em and heal with his dual specc). We swap people in and out of roles as we see fit, I tend to tank a lot but that's mostly because I a) don't have the gear to support a fury specc and b) I just don't like melee dps all that much. That becomes a self furfilling prophecy of course since I get to pass all the good leftover stuff to the other offspecc candidates.
Either way. I am not by far a paper tank. I might have to punch my own survival buttons but at least I'm able to stagger them (though I must admit I was a bit strained on festergut). Bring the tank, not the class?
My lack of proper signature actually is a proud minimalistic stand