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"if you were to shut down the 'old you' (e.g. goto sleep and never wake up) you really wouldn't care. You didn't experience any pain and you don't exist anymore, so you have nothing to be upset about b/c by definition you don't have any feelings."

You could pretty much say the exact same thing about ordinary death. In fact, I can't figure out how it'd differ from ordinary death in any way, except that hypothetically there'd now be an extra entity inside a machine, and that entity would resemble me in some ways.

If you tried to tell most people they wouldn't care about dying, that they'd just go to sleep and never wake up, and they wouldn't feel any pain, few would be comforted by it and take your proffered suicide pill.

If I knew that I'd die painlessly while asleep and that my behaviorally-identical duplicate would seamlessly take over my body in the morning, that's about 95% of my worries-about-death already taken care of. I don't fear nonexistence (much). I fear pain and disability, and I worry about the effect of my death on other people. Gradual-replacement-by-machine would solve those problems nicely. Likewise, you'd get more shrug than horror out of me if I were told that my sister isn't really my sister, "merely" an entity with the same appearance, memories, history, and behavior as my sister.

I agree that by our current working definition here that it would be no different than death. Which is to say then that death is not really to be feared. (Maybe the manner in which death occurs should though) The comfort or lack of comfort is really all in the perception of death. If it was sold as a transference of conscientiousness from your old body to your new body would people accept it differently? (Even though the fact remains that death is occurring)

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