I think the chances of revival are much better than the sliver thin chances suggested by the analogy to Pascal's Wager. While there are many non-technical ways it can fail, no-one is in a position to be very confident that we'll see any of those failure modes - that there will be a general societal failure that stops the LN2 deliveries, or that the cryonics organisations themselves will collapse, or such. And while there are a great many unknowns on the technical side, the more I look into it the more I think that the chances of recovery being technically plausible are high - well into the "more likely than not" side of things.