However if one already owns bitcoins, this problem that you have becomes non-existent.
Yes I think so, cause goverment is a centralized sytem which is contrary in what Bitcoin is, and they will not allow to let a decentralized system can overcome them cause I bet they will loss the control to take kver and monaipulate this which is abide the law of Bitcoin and its existence.
of course it will not happen. Fiat is a symbol of the country, replacing it with bitcoin will only cause problems. enough bitcoin is known as the currency on the internet, even just that, the bitcoin price is very high.