China and India have been bell weathers in the phone payment space. for crypto currency to be truly useful, it is the small utility driven payments that have to be satisfied. When the phone payment system is already widespread in certain countries (linked to fiat) why will crypto make a difference?
you are asking for economies to switch over from electronic money to truly digital currency (cryptos). there has to be a major reason for this to happen and not wishful thinking. so far crypto has not solved the problems that will drive mass adoption.
Foreign exchange on the other hand is an entry point where crypto can drive mass adoption across the world. that way you keep the banking space happy and the consumer happy. it makes it easy for cross border payments and solves traveller’s blues of exchanging fiat currencies.