But unfortunately it's an inherent weakness of the current system, and I'm talking about the medical system here, due to lack of funds, technology, and political will. If we had never ending resources, I suppose we could keep people alive on machines indefinitely, but judging by the health of people who are currently being kept alive in comas, I don't think they would fare very well being bedridden for years or months at a time. There's also the risk that they could suffer irreversible brain damage due to an unstable respiratory and cardiovascular system. After all, life support systems can't repair things like vascular degeneration. At least not yet.