This discussion has been coming up everywhere recently. Although,I do not support the phasing out of the Fiat currency, I can't really find a point to back its existence. But I still think it's asking too much. Even if cryptocurrencies would replace Fiat, it would take a lot of time. But before than happens, some things must be taken care of. Take for example the volatility of cryptocurrencies. Such variable makes it too difficult to be made a major means of exchange. This is only one of the issues that I have in mind.