At the moment, I have standing orders in place that no heroic measures or treatments should be enacted in the event that I am in a terminal or vegitative state. I've communicated clearly to family members that would be responsible for my decision making that things are not to be prolonged or dragged out for the sake of emotional contrivance.
Without knowing how we will die, it's really quite impossible to plan around it, of course. My comment, more or less, expresses my desire to have more control over my exit in the event that I am put in a position to become a massive burden on those I love; this is something I consider a reasonable and rational request, where the folks that make our laws do not. None of that changes without discussing and sharing our viewpoints on the matter, though, which I suppose was all that I was doing.