Hey, that's great! Now you won't need to drop DPS stance for magic damage tank busters anymore.
Increasing defense is the last thing tanks need if the goal is to reduce the effects of the DPS meta. The same goes for healers and getting more potent heals. The only things you can do is nerf them, require more GCDs for mitigation/healing for the same result as now or increase incoming damage to PvP-like levels.
