First of all, my condolences to Doug and his family.
I would urge everyone, this being a forum about Survival, to be very very careful how you use terms like "Quality of Life" Honestly, the last thing I'm worried about is being given life prolonging treatment that I don't want. I'm much more concerned about being denied even the most basic care that I do want. They don't call it the "culture of death" for nothing.
From
http://www.nrlc.org/euthanasia/AdvancedDirectives/ReportRevised2007.pdf However, the laws of all but eleven states may allow doctors and hospitals to disregard advance directives when they call for treatment, food, or fluids. Increasingly, health care providers who consider a patient’s “quality of life” too low are denying lifepreserving measures against the will of patients and families – and the laws of most states provide no effective protection against this involuntary denial
From a survival perspective, think about how many people in survival situations had an absolute zero quality of life and a zero hope for rescue. Yet they kept on going. How many of us would have judged their lives unworthy of living at the time?