That is impossible for anyone to say with any certainty, because the future impact of new technologies are, by their nature, impossible to predict.
The oft-cited statistic is that 2 billion adults worldwide are still completely “unbanked” and don’t even have a basic checking or savings account. One percent of 2 billion is 20 million people (roughly the population of a mid-size country), many of them living in poverty.
A global decentralized currency like Bitcoin could eventually allow what happened with M-Pesa in Kenya to happen more easily in any country in the world.
I've written about this as well. You can skip to the section titled "How Bitcoin can help the poor and unbanked" to read data on how m-Pesa has improved life for many poor and rural Kenyans.
https://medium.com/@petershin45/hate-bitcoin-this-might-chan...