The things we need to figure out are:
1. A power system that all people can use when the grid goes down;
2. A form of Internet (communication) for when the grid and the Net go down;
3. Maintenance of it for all people.
If we don't figure this stuff out, blockchain will be as useless as everything else.
We need powerful generators that use little fuel and are so small that they can be carried in the pocket.
We need decentralized Internet -
IPFS.
We need decentralized communications -
Piratebox.