I agree with the tank taunt changes but making them have such a high damage cap will just make people take tanks over brutes. In high end content everyone is running around at damage caps etc so why take a brute that can deal marginally more damage over a tank that can A: Taunt better. B: Survive better, and hit more targets.
The idea of increasing target cap for tanks is a good one but an increased aggro cap would really make tanks be what they are supposed to be, a brick wall for the team to hide behind.
Brutes will become like scrappers are now, stalkers are just better so why even bother making one outside of "I want one"