Nope. Many people in other parts of the world are very poor. Some don't even have money in the bank nor access to internet connection. However, it seems to be possible in First World countries.
We would always be divided by the fact that there are places where Internet is not used at all. There are places where there are no mobiles at all and people have chosen to remain primitive. This is not questionable at all since there are tribes that really respect their beliefs and even with the modern world outside of their tribe, they will choose to continue to be like that. It's not as if they have no idea of what's going on in this world, it's just that they love their traditional ways so much that they don't want to change it at all. They are passing the tradition from generation to another and so on with hopes that the tribe will continue to live for long.
I think the question here only applies to the part of the world where it is developing in technology. Like, in the cities and towns where innovation is actually embraced. It's possible for a country to change its culture about the payment method that they are using but it's also possible for other countries to NOT be able to change it even though they would want to. This is why digital currencies will be used so much in other places, seldom in some places, and not at all at some places. Which means digital currency will never replace paper money, at least not in our lifetime.