As far as I know you need to be dead already to be put in these facilities. So to get them back, we'd have to find a way to resuscitate them after "defrosting". The point of these facilities is exactly to wait for the technology to get them back to life.
One more interesting variation, while illegal, would be to freeze people when they are nearing death. If we could bring them back later, the scheme would have a chance of working if better surgeries and medicines are available. But I don't think we have the technology even for this.
EDIT: wouldn't places where assisted suicide is legal be cool (pun intended) with my proposed scheme of freezing when nearing death?
I'd also consider it. But an interesting question would be: when should we do it?
Let's assume the doctor says that we have 1 year left but a reasonably good quality of life until death. Should we wait until we're a few days away from death, or go to freezing right after getting the "1 year left" news under the assumption that the disease isn't as advanced and thus wouldn't require as big of a technology leap for a cure?
If we wait, the chances of being cured after waking up are pretty low (we are almost dead already due to the disease), but we'd have lived an extra year.
If we don't wait, the chances of being cured are a lot higher (disease not as advanced) but we might not survive the whole freezing process at all, and thus waste a year of life.
One more interesting variation, while illegal, would be to freeze people when they are nearing death. If we could bring them back later, the scheme would have a chance of working if better surgeries and medicines are available. But I don't think we have the technology even for this.
EDIT: wouldn't places where assisted suicide is legal be cool (pun intended) with my proposed scheme of freezing when nearing death?