Thanks for the great post Jeff.
If the internet is shut down, we can still do Bitcoin transactions because of the Bitcoin satellites which download a full node for free. They went online Aug 15, 2017. It's about a $100 satellite setup you can get from Radio Shack.
If electricity goes down, we'll need off the grid electric to run our laptops. Many people have solar and generators and they'll be happy to sell their electricity for some real money.
We'll be transacting bitcoin with those who have always been unbanked around the world. Entire villages who use solar and a Nokia 1000.
Bitcoin literally can not be stopped. Even if the electric grid and the entire internet are completely destroyed, bitcoin will still be available.