I think if countries introduce their coins of currencies. It would be the beginning of the end of cryptocurency of special tokens with service. Because it would be monitored and controlled heaviley like the fiat money.
The heavy tax and like forigne exchange marketing is manipulated by different governments in the world. The difference between fiat money and cryptocurency money was the letter is market drivin and personal bases. But the former is government own and politics drivin and also mega companies dependent.
If the cryptocurency is coordinate and coorilate with fiat money it would be in the hand of infulence and not defiantly market driven. So day trading and inveztment in cryptocurency would be not predictable and heavely taxed like wind fall tax.
Respect