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.