I don't like the idea.
I'm Shadow and I dps. In my raids the situations for me to DH are minimal.
In all fairness. I prefer not to since I know I do a hell of a better job just doing what I'm supposed to do.
While I understand the viewpoint they're using I don't want to be forced to heal. Not even occasionally. Period.
Selfish? Maybe, but I trust my healers.