There are positive and negative side if this will gonna happen. The positive side I think is, there will be no corruption in the government because cryptocurrency is decentralized therefore they cannot trace and taxed it and no banknotes for them to be greedy of or currupt.
Negative side is, no control, no body can control the flow and amount of cryptocurrency in one country. Government have no control either so my concern is the economic status of one country.
exactly that's what iam thinking too in fiat currencies government are in control they know what is coming in and coming out they also do the payday for government employers but if crypto currency toke over what will happen that's my question how will government control it will it lead to total chaos or the opposite