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.
Honestly, in just a few years, if all countries began to adopt cryptocurrency, whether it be Bitcoin or any other altcoin, cryptocurrency will be considered as a global currency, if the whole world starts to engage and participate in such activities then it is already considered as a global currency, it doesn't have to be the main currency since we all know that fiat also plays a role, this is the future, and in just a few more years, cryptocurrency will grow bigger.