Not really an issue. I fully intend to resolve the legalities of that before it becomes necessary.
Unless you're talking suicide or giving Dr. Kevorkian a call or moving to Amsterdam then you're sadly mistaken if you think any kind of advance directive is going to save you. I can guarantee you that with the legal precedent the Schiavo case has set, I can make legal mincemeat out of any so-called "Living Will" (really a Dying Will) if that is what you are implying. Just allow me to pile up enough (conflicted) hearsay evidence and have a sympathetic (and conflicted) judge allow it as admissible, and I'll shred any document you can bring into court. And any "appeals" court will uphold that shredding because of the outrageous hold that Stare Decisis seems to have in the court system today. The whole thing is utterly corrupt and stacked in favor of those who would kill first and never give a thought to mercy or, heaven forbid, doing the right thing.