Unless you can't drop cryonics and sign up for organ donation once you learn you need a transplant, there's no real loss here, even in this unlikely scenario.
Well presumably under soreff's scenario, there would be some sort of exclusionary period in place to prevent people from waiting to opt in until just before they need a transplant.
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: