I think only a permissionless system could be an acceptable alternative to cash. Bitcoin and most other cryptocurrencies satisfies this. However, being traceabl

I think only a permissionless system could be an acceptable alternative to cash. Bitcoin and most other cryptocurrencies satisfies this. However, being traceable is a major downside. Monero is not practically traceable and has much lower fees compared to Bitcoin. I hope to see it being used more in real life transactions.