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Yeah, and over a very long crisis, some of that could become relevant. (The general concept of bootstrapping technology from nothing is kind of an obsession of mine)
Before equipment starts to wear out, anything that can run off a solar panel will continue to work (if you can afford it), though, and it's hard to picture there not still being metal everywhere any time in our natural lifespans.
In a short-term disaster, just how to survive your local climate and navigate without help until things go back to normal is the main concern. And you can pretty much rely on other people being helpful. In the medium term, the way people live in the third world or remote areas right now is the best source.