The problem that a lot of you seem to forget is that no brute is constantly at 100% fury, nor are they constantly at 70% fury in groups. With the agro changes they will have even more trouble keeping fury up so tanks WILL do more damage.
Edit: Regardless, I have made my opinion very clear at this point so I will be leaving this discussion so other people can chime in. I just hope more people see how bad a change this would be.