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.
You do realize that a cryptocurrency based economy can exist over borders and circumvent through government laws right?
This statement is dumb for so many reasons. There is a clear difference between circumvent and avoid. Don't you get that?
Any time you want to make significant purchase in real-life with your anon currency you are fucked. But by all means you can avoid that by living in your mothers basement.
all in all, semi-valid points, mainly if it was possible to turn off the internet.
ultimately though, i speculate that governments will allow this type of tech to persist the same reason they do many things - big corporations / banks will force them to. Once the business / banking world gets over their daydream of permissioned blockchains, they will realize the power of the decentralized ledger provided by cryptocurrencies. Due to its current size, they will first investigate bitcoin, then they will realize the inherent flaws of a transparent ledger, and hopefully by that time Monero is chugging along nicely and these companies will go "hello" and Monero will go "would you like some ring signatures?" and they will live happily ever after.
Also the cost of "doing something about it" from a gov point of view. I work in the sector and there is not infinite funds. It has to be chosen what to do and scrutinised to the nth degree for clear and proportionate benefits.