I highly doubt they will "fix" tank dmg until a new raid is coming. Cause atm. Heroic encounters really do rely on tank dmg. And if you nerf tank dmg above the "/sit to abuse Vengeance" sorta thing, it will become an issue.
I honestly don't mind them looking at tank dmg come next Tier, but now is not the time. At the same time, as a tank, I really do enjoy having something to "work for" on trivial encounters, where I just have to tank. That's when stuff like rankings become even more interesting, cause there's nothing else to do really.