I decided that I am for life. I don't care about "quality of life"; that's not mine to judge. I've just determined that everyone needs to be given the opportunity to live. Life is the breath of God. God breathed life into us and all humanity has that. And no matter the quality of life, we each have only one. I don't think its for us to decide anything about when it ends. Besides, there's the whole slippery slope deal, but I don't want to talk about that.
It is always difficult for me when someone decides to "pull the plug" on someone. Even when it looks hopeless. But I try not to judge because I know that in most cases it's done out of love. The Terry Shaivo case was a different story, but I don't want to talk about that.
Anyway. It has been my decision that I won't pull anyone's plug and I do not want mine pulled because many times someone has been declared dead - even brain dead, and still survived.
On the other hand, you can't keep someone on those machines indefinitely.
The good news is that God is ultimately in control of life and death. No matter how big for our britches we get - He is still God. If it is time for someone to go, all of our interventions aren't going to make any difference. If He still has a purpose for someone on earth -- if it isn't their time to go, then nothing we do can change that either.
*side note: I saw a story of a man who had shot himself point blank in the head and lived. Not once, but two or three times. Its absolutely heartbreaking that he was so desperate to die, but it shows that we don't have as much control over things as we think we do.*
Anyway, please go read this short, amazing story that demonstrates that diagnosing death isn't as cut and dry as we may think - and also the fact that it ain't time until God says its time.