You could probably just keep interchange fees on debit card transactions and still a lot of the other benefits. It would help pay for the services and support a

You could probably just keep interchange fees on debit card transactions and still a lot of the other benefits. It would help pay for the services and support and make the banks less suspect that everyone would switch over. I imagine the underbanked and unbanked individuals that would want this service aren't actually craved by the private banks right now. Building out an ATM network though would probably be ridiculously expensive. You could probably just build them into the USPS though. I think Japan does this?