After reading most comments here, few/none mentions the real "technical" challenge with such idea : society.

Even if the tech would be able to "revive" them, they also need to bet that : - the company won't go bankrupt (how many corporations last 10yearS?50?100?) - no technical issue happens (blackout, computer bug, ...) : this increases with each year added - society's law/structure will remain the same (democratic, not a chaos)

So unless it is government-backed I would not bet much on the success rate...