Don't worry it will not be elliminated abruptly but slowly and gradually. It will take some time to totally be elliminated as a currency. Expect it when total cashless be implemented.
I don't think this will still be a problem to us since this "cashless" era are still so far from now. I think we are dead at the time that digital currency are being made as the fiat currency or the main currency of a certain country. Fiat currencies will never be eliminated or defaced immediately, Bitcoin is the oldest crypto currency but still, there are no legit information about a country making a digital currency their own currency.