Something that has been unclear to me is how will governments survive when fiat is nowhere to be seen and all or most monetary transactions happen via cryptocurrencies.
Since one of the most attractive aspects of crypto is that its anonymous and decentralized, how will governments be able to keep track of money and tax it.
Fiat cannot be killed by cryptocurrencies. Technology, and the world as a whole aren't advanced enough to go completely digital. Infrastructure issues and accessibility issues have to be addressed. Heck, not even everyone in the world has access to the internet. You can't really deprive them of money can you?
Governments will still tax as they usually do. Businesses will need permits to operate, and their financial activity may even be more transparent thanks to the blockchain. Private individuals will need to declare their income as they always do. I don't think it's going to be a big issue, honestly.