There is a big competition is going on between local currency and cryptocurrecies. If crypto enters in to the market surely it will disappear the local currency. Because the benefits is large when compared to local currency. So people automatically use cryptocurrency only. In future surely bitcoin will rule the crypto market.
But before using Cryptocurrency they must buy with local currency right ?, I assumption Cryptocurrency very good to use for a payment gateway, because people using Bitcoin for made some transaction to make more easier and efficient.