Such a thing is very hard to imagine in developing countries but it can be very helpful. This will be possible only when the government in those countries is ready for this.
cashless society become more realy with cryptocurrency coming out, people keep dreaming about this and i do heard this idea since i was a child and yet it still not happening. But i do think we need to takes a lot of time to make it real and i think crypto would be good option to help us to make it real.