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.
It is possible that maybe BTC could be a global currency in the future. As we observed nowadays, technology is developing or improving that would be the best solution to gain or earn. From the level of widespread adoption and acceptance it is easy to presume such things to happen. But, let's not forget the growing popularity in cryptocurrency that BTC was the main head and father of all cryptocurrencies. So if there's such thing or cryptocurrency that is going to be a global digital currency in the future, no doubt it will be Bitcoin. Maybe there's a lot of issues on it but still BTC overcome those issues and still continue to be unique among other currencies.