Yes money is like a tool or function of a large society in a dire situation especially with modern communication breakdown the people left will likely resort to barter more like in small tribal societues. You make lots of interesting points too, with regard to the tangibility Bitcoin is really money for the modern age if things are well less modern in the future perhaps tangibles will come back.

Perhaps I need to Faraday cage my node! In fact if micro grids and ones associated with miners started doing it it might encourage the national grids to finally start taking steps....