Okay I will finally weigh in on this topic
Terry's husband is not ethically or morally wrong in what he is doing. That said, I have to say if I was he I wouldn't be so insensitive as to do this against such strong wishes by the family. If they want to hang on 'til Kingdom Come I'd personally respect that.
Terry may have wanted it differently but it doesn't matter one way or another as she is a vegetable.