Bitcoin behaves rather badly under global scale network partitions, or if your global network has a latency of over an hour. But on the other hand it is completely immune to collapse of governments
This reads like a parody of Bitcoin fanatics. You can't be serious.
I bet two people pull that off before those communities ban BTC.
Bitcoin might be postapocalyptically valuable if the apocalypse in question has hyperinflation at its core, but in a scenario without that it will be inferior even to vintage paper money. The true availability of BTC within a given community is just too much of an uncertainty. What could be a sizable fraction of the amount in active circulation one day could be completely devalued due some early adopter backup going live a day later.
It's of course a problem for low income workers, but here we are talking about the super rich.