I mean, it kinds seems inevitable to me. Books has become e-books. Cash is becoming digital transfers. China has done it. The west is mostly doing card-swipes. One day, that transition will be complete, and cash would be phased out.
What happens then? Think like the power outage in Spain recently. Some people had cash. But in 20-40 years. There might not even be any cash in existence. What then?
What if, instead of a few hours, its a few days? Or weeks?
I guess riots break out all around the world?
(Seriously, has none of the politicians ever thought about this? Where are the backups? Are we just going full “YOLO” on the reliance on the power grid?)
Humans don’t plan ahead for preventables and get angry if you diminish current QoL for long term safety. We know this. Earth getting a direct hit solar flare ends civilization. There’s no divine safety guard rails, we’d just be fucked. Probably not extinction though. Just a lot of violence, extremism, and starvation getting to that point of very diminished stability again.
I like your use of “when” because it is fairly likely to happen one day. It already has, and Morse code had just been invented IIRC. Not that long ago, just wasn’t a big deal then.
Did you hear the news about definitive proof of rogue black holes? Billions of them exist in the milky way it is thought now zipping around fucking shit up.