Don't you understand? None of that will matter in a crypto currency based economy.
The only reason you need to deal with fiat now is because few accept crypto, and none pay crypto.
Think beyond 10 years. Think beyond 20.
A crypto currency based economy would still not be exempt from all laws. And if laws can't be imposed it will be illegal. And if it is illegal then you will see no 'crypto currency based economy'. Wake up.
governments are not almighty.
they havent forbidden cash (ok some are trying to limit it)
they havent forbidden gold
as soon as an economy is using it, they want to tax it - and not forbid it
In your utopia, do you honestly think governments are going to let a anonymous currency get traction in their country so it has the possibility of hurting the nations economy? Just because "they want to tax it"?
And don't give me that bullshit about cash because it is issued by governments.