I agree cash is the right idea, for now, but can you say for sure cash payment will be possible forever, or even the next 50 years? Wouldn’t it be better to blunder around with new ideas while cash is still a good fallback? Not saying I like crypto, and the cost on resources and the environment sucks bad, but I can least appreciate them trying something. Now we just need to come up with sustainable options…

I get that cash seems a pretty durable idea, and it’s lasted for hundreds of years, but it did so before the massive societal turn towards technology we’ve made in the last 30 years.