I perfectly understand the appeal though. Automatic book keeping, no more cash to move around that can temp thieves, less mistakes and cons.
But for the society ?
This just get rid of another grey area, a safety valve, a space so you have margin to maneuver.
Indeed, no systems are perfect, but they will try to enforce their own rules, and have a big inertia and cost to be changed.
Having those greys area allows for people not to be crunched by the unperfect system, or to experiment with alternatives that the system would not let exist.
Without cash, kids can't mess around as much without adults knowing. But doing so is very important to their development.
Without cash, you can't pay for a service that is illegal, even if it's not immoral. Do you know that we have freaking tomatoes that are legal to grow, but illegal to sell in France ? Yes, delicious, healthy tomatoes.
Without cash, you can't finance an activity deemed immoral, even if it's legal. Because people will learn about it and make your life a leaving hell.
Without cash, you can't disappear. But what if you need to ? Do you really trust the system to protect you if your life goes south ? We are not in the movies, the cops won't post guards in front of your house because you dated a drug dealer.
Without cash, you don't have the right to make mistakes. How many of us are perfect ? I'm certainly not, and I paid for plenty of my sins. I have many purchases I'm not proud of, but I would like them to be forgotten.
Without cash, there is no black market. Which mean if I'm looking for something that is not allowed in my country (say, boric acid to kill cock roaches), I can't.
Without cash, society is less resilient. Power outage, network trouble or your card being unusable make you unable to pay for anything.
Without cash, we give way too much power to entities managing the payment systems. Card companies don't like you ? You can't pay or take money anymore. That happened with wikileak, remember ? It was not illegal in my country, but VISA and paypal sure prevented me to make a donation to them. They stopped me to use my money in a legal way because they didn't like it. This is such a slippery slope.
So yeah, cash can be misused in plenty of ways. So can be a knife. But I certainly not want my life to be limited to a spoon-only consumption.
Also, saying it will fight cash laundering is telling only half of the story. The super-rich will still be able to do so.