If you find a reliable cryonics group, that’s exactly what they do. Alcor, for example, stores bodies upside down in tanks of liquid nitrogen so that if the power and backup power go out, it will still take a lot of time before the corpses defrost down to the head.

1. They store the bodies upside down in tanks of liquid nitrogen so that if power and backup power go offline they still have a while before the nitrogen boils off.
2. Assuming revival becomes possible, it will likely decrease in expense and difficulty as time goes on. It seems likely that at some point people would be woken up just out of curiosity or for a study, once it becomes cheap enough.