A lot o f people are pointing out that this wouldn't be true immortality, since the body would eventually break down just like a car. Eventually people just can't afford to keep fixing them. Though this thought process is flawed in itself. We're not hard wired to keep our transportation running. We ARE hard wired to survive at all costs, which includes repairing our bodies. The more likely alternative is my idea for a machine "judge" which presides over a sudo-afterlife. In this system, the judge would analyze the events of your life, your personality, what choices you've made, what benefits you've given to mankind; it would then determine if you led a productive or detrimental life for society and if the former, it would create an ai imprinted with your mind/memories/etc. This mind would then be uploaded to "The network" a virtual reality world where you can continue to live forever as a computer program. Your relatives could even visit you through a vr interface. Those who drastically changed the world for the better could even contribute via remote robot bodies, allowing them to continue their scientific research, for example. So essentially, it's like religion. Only there is no arguing if any of it exists or not. And there's no "grampa is up there watching over you". Instead it's "grampa made it onto the network. We'll visit him tomorrow and you'll feel better."