I find a hundredfold cost decrease quite unlikely, but then, I'm not familiar at all with the costs involved or their potential to be reduced. If the idea of cryonics were accepted widely enough for it to be an acceptable alternative to more expensive treatment though, freezing old people with negative utility to society until a potential technological Singularity or merely the advent of mind uploading would not be far off - and that would be efficient even without cheap cryonics.