I don't think so. I mean potentially maybe. But I would think that the possibility of an EMP weapon being used, that would knock out internet access and fry any storage devices/cold wallets/hard drives and other devices would render crypto an unsafe bet.

In war time I think you would want a physical asset in your hands, be it gold and sliver, physical dollars, or even some other physical asset that would be worthy of trading for goods and services. I don't think it would be very smart to load up on anything that is exclusively digital.