While I am not asking about a large-scale nuclear/EMP event, I am asking what value a cryptocurrency has to its holder - as a tangible thing, which one can trade for food, for example - when the infrastructure does not work.If it is a currency - a medium of exchange - how can it be used for that exchange without the infrastructure that supports it being accessible at the moment of the desired exchange?

What you should be looking for is a way to get them to vacate without using the "nuclear" option.

Look what happened after WWII, the fear of communism global nuclear destruction. 

I work at the Nuclear power plant so my schedule is weird and offers me a lot of time off during the week days.

It's just a glimmer of sunshine before nuclear winter sets in!

Thanks to those that gave insightful information without going nuclear on the political spectrum.

But for me evicting in winter is the nuclear option already: I like having the ability, but I almost never exercise it. 

Pick your battles and save your nuclear option for when it’s actually necessary!

And since they have nuclear weapons they usually win the argument!

The next one would be nuclear or biological.