Ultimately, he always does.
Who supports the person is beside the point. Are you in favor of keeping terminally ill people alive indefinitely?
I am if the family is paying for it. Their decision, not mine, and not a doctors.
Some posters on the Schiavo threads apparently are. Not all, not most, but a not insignificant fraction of them. A few of them have even called for ending the concept of the living will. A lot of nanny staters on FR when it's an an issue where the gubmint can be useful to them.