Even if it's in writing?
Well, I disagree.
That's where living wills are dangerous. No one foresaw the day when nutrition and liquids would become "life support". I always thought that a living will would be a good idea. If I were terminal, I wouldn't want them to resuscitate me. If something should happen, and I lingered breathing on my own, let me be. Feed me, water me, and medicate me, but don't kill me by starving me to death. Oh and for God's sake, give me a decent blanket. The ones at the hospital wouldn't keep a hamster warm.
Not only do average Americans now need to speak lawyerese, but they need to learn how to decipher Clintonese.
So be careful when you say "in writing", because a feeding tube is now in the same category as true life support. Once again, I'm talking about machines that do the work for the organs that failed.