And who carries enough cash around to be useful any more?

I do. Maybe not physically in my pocket, but between my wallet and my home there’s enough cash to buy a tank of gas and a few days of groceries.

Parts of the debit/credit processing system are fragile enough that I’ve seen them down randomly for signifigant portions of a day.

Cash has got me food when other people have been stuck without the ability to pay more than once in the last couple of years.