Now as for your statements.... correct me if I'm wrong, but you seem to be focusing on the "suspended animation" side of things. Right? If yes, then here is Thomas Donaldson's response (bolded parts courtesy of me):
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"We would all like "proof" that cryonics will work. There will never be proof that cryonics will work. Certainly, individual people will be revived. Some of them (we hope a very large percentage) will actually come back as the same people as those who "died." There will certainly be proof that we can successfully freeze human brains and definitively preserve personality, identity, the "soul", or what have you. But those things aren't cryonics, they're just particular technologies. They don't really embody the key idea. The really key idea in cryonics is the idea of freezing (or otherwise preserving) people when we don't know if we can ever revive them. Of course, we intend to figure out later whether we can do this. We intend to succeed in reviving them. But before we've actually done so, we certainly can't prove we will succeed. And funny thing, after we've done so, the proof will be irrelevant. If we know how to bring somebody back as a fully functioning human being after an hour of ischemia, why should we ever bother to go to the added expense and trouble of freezing them first? That would be bizarre and unnecessary."
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Thomas Donaldson once wrote a very poetic and beautiful short shory titled Travelling which explores the very outer limits of identity preservation when very little was left, and what life might be millennia from now, among distant stars.
