Yes, It can be expected that cryptocurrency will be a Global currency in the future.
The BTC will be the father coin and there will be a lot of sub coins.
Cryptocurrency is a unique kind of currency that has great potential.
It has an attraction for all ages of life. It has a great opportunity for those who want to do something and desire to step forward.
Moreover, It has equal chances for poor or rich for development .
This currency has brought a revolutionary change in the world of business and trade.
It promotes a positive activity also.
I think not entirely the currency will be a global currency because there are many other currencies especially fiat .BTC is very difficult to replace fiat most of the CBDC will also be loved by the governments of the country like . because this CBDC only runs on blockchain, it can only make the country's finances transparent and clear. I think each type of coin has its own function and nature we should not compare fiat and BTC anymore.