Cryptocurrencies definitely have some benefits over flat currencies, such as the fact that they are not bank-controlled or limited and government-dependent, but there is still a long way to go until we can conclude that Crypto is better than Flat. In the physical world, flat currencies are easier, faster and better to use in almost every situation, so in my opinion we will continue to use flat currencies until BTC or any other coin gets full acceptance from all the different markets.