Yes fiat is necessary for the economic growth of a country even if we like or not. Fiat currency has it's own merits as well. Because it can be use for loans and to pay your taxes physically. Both digital and fiat currency can coexist, both has it's pros and cons and even help each others growth. bitcoin for me is another source of payment that is decentralized and free of control.
Yes, that's true about Fiat Currencies, but have you considered the prospects of Crypto-currency. Prospects development of cryptocurrencies exist, despite the fact that attempts to introduce a digital currency have taken place since the advent of the Internet, in fact, the use of digital money is in a moderate way. The opportunities of using cryptocurrencies include: the absence of inflation, the anonymity of the user, uninterrupted operation of the program in a server mode, quick transfers anywhere in the world, no counterfeit, ease of storage, the possibility of splitting into parts, and there are no fees for transactions, low fees for the exchange.