This will never happen. They are not nerfing Warrior burst, and Warriors at present have got enough power to stunlock one to death with no crits at all scored. Happened to me a few days ago. Warrior with 1/3 health left stunlocked me to death while I was in PvP gear, full health and buffed up. I checked my log afterwards and he scored not crits at all. Everything was just normal damage. Imagine what would have happened if he did crit.
^^This kind of burst is NOT getting nerfed, so I really wouldn't be worried about healers dominating as Warrior combos will continue to be hot even in 5.1.