Check out this article that features some predictions he has made (this year) for the future: https://www.weforum.org/agenda/2017/05/bill-gates-is-pretty-good-at-predicting-the-future-this-is-what-he-thinks-will-happen-next1

Especially this part:

"By 2030, 2 billion people who don't have a bank account today will be storing money and making payment with their phones," he wrote in his 2015 Annual Letter. "And by then, mobile money providers will be offering the full range of financial services, from interest-bearing savings accounts to credit to insurance."