I'm not sure I understand why you're worried about losing DPS by weapon swapping, when swapping, hitting the clickie and throwing a mass cure, all of that, takes less time than quickened mass heal. Not only that, but you only need to do it every ~5-10 heals.

Rather than quote snipe the rest of your post, I'll just try to generalize the disagreement: there are some situations when healing where empower healing is better and there are some times when maximize is better. However, because of AoV, and other things mentioned, a WF FvS will be a significantly stronger offensive caster, even WIS-dumped. That means U9 empower will be, proportionately, ALSO stronger than empower heal, compared to the situation as it is now.

I thought it was a close call between the two even before, but for me, the changes make empower heal a second-rate feat.