If someone is still cryopreserved when technology becomes available to revive them, then they will be revived simply because there are people around who cared enough to maintain them until then. Cryonics is not like beaming messages into interstellar space, or putting messages in bottles, not knowing where they will land. Patients are continuously cared for by people who personally care about them — friends and family in many cases. In time those people will also be cryopreserved, and their friends and families will remain concerned about their care, and so on. Since the progression of cryonics technology makes cryonics a last-in-first-out process, this scenario will eventually reverse itself. People will be motivated to recover their friends and family, and then those people will be motivated to recover their friends and family as recovery technology improves, and so on.
There is another reason for optimism about future motivation for revival. Long before it ever becomes possible to contemplate revival of today’s patients, reversible suspended animation will be perfected as a mainstream medical technology. From that point forward, the whole tradition of caring for people who cannot immediately be fixed will be strongly reinforced in culture and law. By the time it becomes possible to revive patients preserved with the oldest and crudest technologies, revival from states of suspended animation will be something that has been done thousands, if not millions, of times before. The moral and cultural imperative for revival when possible will be as basic and strong as the obligation to render first aid and emergency medical care today.
Cryonics patients have nothing to fear from the future. Reaching an era when people actually debate whether it’s time for revival is the best problem a cryonics patient can have. The real risk and uncertainty in cryonics comes not from the future, but from the present. Can cryonics patients outlast a primitive culture that still regards them as empty shells (“remains”) to be disposed of?