The closer money comes to becoming 100% digital the more important having something physical like gold will be. Sooner or later the power is going to go out on digitized currency, banks will close the doors and people will require some sort of currency and resort back to things like silver and gold before paper money became the standard. I agree that in essence Gold is useless unless used for wiring or circuitry but you still need some sort of item to trade, unless you just have big guns and steal everything.
The best currency to have in a full out war are guns. No need to buy shit when you can just take it.
