I would just go to my bank and take out cash. Even when the power is out for weeks after hurricanes, my local bank comes up on generator power.
If we’re talking doomsday, all credit card processing is down forever-type scenarios, and I can’t get to my cash because the banks are overrun by terrorists or zombies or the plague, I don’t think greenbacks are going to be much use anyhow. ;)
That’s like saying that if you ran out of gas you would just walk the 3 miles to the gas station. Just seems easy to avoid and an unnecessary risk. Oh well, it’s obviously your choice.