The key to each currency change has been that the replacement solved a problem inherent with the physical properties of the incumbent. For example, a major driver in Sweden to go to an e-krona is because of the energy intensive resources it takes to make, use and circulate physical cash. Cryptocurrencies will solve other problems common to physical cash, such as no limits printing, forgery and other criminally inspired activities, both performed by governments and heavy set guys called Mario.
