The only logic flaw I see is that dying in a fire doesn't seem conducive to having a well-preserved brain - being on fire is sure to cause some damage, and as I understand it buildings that are on fire are prone to collapsing (*squish*). (There is an upside: If cryo was common, there'd likely be a cryo team on standby for casualties during a fire that was being fought. That wasn't obvious to me when I first thought about it, though.)