Eventually, this is what will happen because as the worlds moves away from paper kind of money, the government will move with as well or else they produce money that no one will use and at the same time they are bringing out policies that would aid a cashless economy which digital currencies supports this objective as well. What would make it different from the crypto we have is because this one would then be controlled by government, the acceptance would be wide because of the legal backing they would give to it, there would be massive deployment of training and in other to increase its penetration in the economy.

Other than the above, it would still be not different from our individual country's currency that is not acceptable outside the border but this would then create a new market just like the foreign exchange market where currencies are traded. It is in this market that the bitcoin and other crypto currencies that would survive till then would have their day.