The latest guest on "Real Time with Bill Maher" was a former head of national cybersecurity and infrastructure, and he said that cryptocurrencies are one of the largest sources of cyber threat because they give more incentive to criminals to be paid anonymously. Basically hospitals, schools, governments being forced to pay crypto ransomware. Personally I don't fully agree and there is much more nuance/debate, but I can see how the government would use the threat of ransomware as a way to ban it.
I agree with you basic sentiment of 'never say never.' As for your analogy, USD as the world's reserve currency being the Titanic would be better fit. As long as there is civilization; decentralized, permission-less, trust-less transacting of value across a communication channel is the pandora's box development that can't be put back in the box. As of now, BTC transfers $137k/sec. <-this number will only grow
You are describing something un-fungible to something that is. Nigeria is a recent nation state's example of futility. BTC transactions in that country have only exploded since the ban.
With the development of DeFi insurance products, the use of this strategy will most likely increase in the future. https://www.bleepingcomputer.com/ne...-wallet-frozen-by-uk-court-to-recover-ransom/