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RowanE comments on Open thread, Dec. 1 - Dec. 7, 2014 - Less Wrong
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Good futurology is different from storytelling in that it tries to make as few assumptions as possible. How many assumptions do we need to allow cryonics to work? Well, a lot.
The true point of no return has to be indeed much later than we believe it to be now. (Besides does it even exist at all? Maybe a super-advanced civilization can collect enough information to backtrack every single process in the universe down to the point of one's death. Or maybe not)
Our vitrification technology is not a secure erase procedure. Pharaohs also thought that their mummification technology is not a secure erase procedure. Even though we have orders of magnitude more evidence to believe we're not mistaken this time, ultimately, it's the experiment that judges.
Timeless identity is correct, and it's you rather than your copy that wakes up.
We will figure brain scanning.
We will figure brain simulation.
Alternatively, we will figure nanites, and a way to make them work through the ice.
We will figure all that sooner than the expected time of the brain being destroyed by: slow crystal formation; power outages; earthquakes; terrorist attacks; meteor strikes; going bankrupt; economy collapse; nuclear war; unfriendly AI, etc. That's similar to the longevity escape velocity, although slower: to survive, you don't just have to advance technologies, you have to advance them fast enough.
All that combined, the probability of working out is really darn low. Yes, it is much better than zero, but still low. If I were to play Russian roulette, I would be happy to learn that instead of six bullets I'm playing with five. However, this relief would not stop me from being extremely motivated to remove even more bullets from the cylinder.
The reason why the belief in afterlife is not just neutral but harmful for modern people is that it demotivates them from doing immortality research. Dying is sure scary, we won't truly die, so problem solved, let's do something else. And I'm worried about cryonics becoming this kind of a comforting story for transhumanists. Yes, actually removing one bullet from the cylinder is much much better than hoping that Superman will appear in the last moment, and stop the bullet. But stopping after removing just one bullet isn't a good idea either. Some amount of resources are devoted to the conventional longevity research, but as far as I understand, we're not hoping to achieve the longevity escape velocity for currently living people, especially adults. Cryonics appear to be our only chance to avoid death, and I would be extremely motivated to try to make our only chance as high as we can possibly make it. And I don't think we're trying hard.
About half of your list is actually an OR statement (timeless identity AND brain scanning AND simulation) OR (nanites through ice), and that doesn't even exhaustively cover the possibilities since at least it needs a term for unknown unknowns we haven't hypothesized yet. It's probably easiest to cover all of them with something like "it's actually possible to turn what we're storing when we vitrify a cryonics patient back into that person, in some form or another".
And the vast majority of cryonicists, or at least, those in Less Wrong circles who your post are likely to reach, already accept that the probability of cryonics working is low, but exactly how low they think the probability is after considering the four assumptions your list reduces to is something they've definitely already considered and probably would disagree with you on, if you actually gave a number for what "very low" means to see whether we even disagree (note: if it's above around 1%, consider how many assumptions there are in trying to achieve "longevity escape velocity", and maybe spread your bets).
And, as others have already pointed out, belief in cryonics doesn't really funge against longevity research. If anything, I expect the two are very strongly correlated together. At least as far as belief in them being desirable or possible goes, it's quite apparent that they're both ideas that are shared by a few communities such as our own and rejected by other communities including "society at large". How much we spend on each is probably affected by e.g. cryonics being a thing you can buy for yourself right now but longevity being a public project suffering from commons problems, so the correlation might be less strong and even inverse if you check it (I would be very surprised if it actually turned out to be inverse), but if so that wouldn't necessarily be because of the reasons you suggest.
I would say it's probably no higher than 0.1%.
But by no means I'm arguing against cryonics. I'm arguing for spending more resources on improving it. All sorts of biologists are working on longevity, but very few seem to work on improving vitrification. And I have a strong suspicion that it's not because nothing can be done about it - most of the time I talked to biologists about it, we were able to pinpoint non-trivial research questions in this field.
I think LW looks favorably on the work of the Brain Preservation Foundation and multiple people even donated.