...let's assume the worst case regarding current cryopreservation technology. Assume it does too much damage to work regardless of what future tech is possible. That does not rule out advancements in cryopreservation tech in the near term... within our lifetimes...
In general, I agree, but I'm not sure about the "within our lifetimes" part. I understand that cryobiology has made progress, but I am not convinced that it's moving fast enough. There's a huge difference between preserving tissue slices or even small organs for a relatively short amount of time, and preserving entire organisms (or at least their brains) for centuries. We can't even preserve plant seeds for that long, AFAIK.
Even SENS, which aims to avoid most of the work of unraveling metabolism
I am ashamed to admit that I don't know what SENS is.
Losing a piece of the brain does not always translate to loss of function, in fact many areas seem to operate independently of each other.
Agreed, I never meant to imply that this is always the case. But for each Phineas Gage, there are many more patients who suffer brain damage and never wake up. In addition, I would argue that what we really care about is the preservation of the person's personality (which just happens to be powered by the brain). Yes, this is not an all-or-nothing proposition, and there are degrees of success. Still, if the person who is revived has a totally different personality from the person who went into the cryotank (as I believe was the case with Phineas Gage), I'd count that as a failure.
"Future technology" may sound hand-wavy, but it is a compact way of describing a very large set of potential technologies, all of which could independently or in conjunction lead to reanimation of a sufficiently well preserved person.
Sorry, I don't mean to sound too adversarial, but I'll have to press you on this point, as this still sounds hand-wavy to me -- more so than before, in fact. I am not doubting "future ingenuity", but you can't justify cryonics by invoking some sort of an unimaginably ingenious future technology about which we currently know nothing. Violating Occam's Razor makes your argument weaker, not stronger.
Bear in mind that plain-vanilla biology is already something that operates on a molecular level, and accomplishes very sophisticated results...
Agreed, but there's a huge difference between existing bacteria, and even viruses (which I fully agree are amazing), versus the kind of precise molecular machinery that would be needed to reconstruct a brain. It would have to be small enough to fit into the intercellular matrix, for one thing. I don't want to get too far off-topic, but basically I'm not convinced that MBT is any better than MNT in terms of feasibility.
Of course there are third options to be explored. As it happens, currently I'm allocating money towards living expenses and paying down my credit cards rather than cryonics...
Ok, I'm going to press you again. If you are convinced that cryonics is the way to go, and this is the best possible prospect for gaining eternal (or, at least, sufficiently long) life, then wouldn't it be logical to put every available dollar toward your own cryopreservation ?
One might also simply send a check to the cryobiology researchers, for example.
Well, yes, but you could also send a check to Alzheimer's researchers, or cancer researchers, or physicists and other pure science researchers, or even to SIAI.
If I spend money on cryonics now, that makes it more likely to be more obviously worth someone else's while later.
Hopefully it's equally obvious that I disagree with you that your proposition is "obvious" :-) In addition, it all depends on what you mean by "later". How much later are we talking ? A hundred years later ? A thousand ? A million ? The further into the future you look, the more nebulous it becomes; and thus your expected utility gets lower and lower as the probability decreases. Which was kind of my original point -- it's the low expected utility of cryonics that gives me pause, not its absolute payoff.
In general, I agree, but I'm not sure about the "within our lifetimes" part. I understand that cryobiology has made progress, but I am not convinced that it's moving fast enough. There's a huge difference between preserving tissue slices or even small organs for a relatively short amount of time, and preserving entire organisms (or at least their brains) for centuries. We can't even preserve plant seeds for that long, AFAIK.
Yes we can.
The fact that you keep mentioning timescales suggests that you haven't internalized the fact that we are talk...
From Mike Darwn's Chronopause, an essay titled "Would You Like Another Plate of This?", discussing people's attitudes to life:
Conclusion, graphs, and references in article. As usual, I recommend reading Chronopause.com as Darwin has many good articles; to quickly link a few: