Yep, people are stupid. And people will stupidly agree with becoming a cashless society for convenience and perceived safety. It is destined to cause a lot of grief I reckon.
Say you are lucky enough to have a decent sum in a savings account because you never entirely trusted the risky super savings plan for your retirement. Say you start to worry that your "money" is nothing but digital numbers on a screen and decide it would be prudent to take some of that money out of the bank and keep it in cash. just as a personal backup plan to ensure that you will never be left totally broke through circumstances you have no control of. Say you take hundred dollar notes deciding a smaller bundle will be easier to stash and keep safe from thieves.
Now just say that some day in the future, you need the money because the unthinkable happened to the digital banking scene and you have to break out the bundle and pay for something with a hundred dollar note. According to popular belief by then, because there's been a concerted effort to phase out cash, the person you try handing your legitimately earned and saved money to thinks you must be either a tax cheat, a crook, or a terrorist. You are not a criminal, but you're going to be treated like one.
What happens if the pretend money we all rely on dries up suddenly and no one has cash?
Moral of Harrow's story, cut the cord if you stash your bundle in the microwave.