Earlier quoted context omitted.
The majority of people in the world can't get a credit card.
This argument does not help. Those same folks cannot carry around a crypto-buck either. There are plenty of mobile-only banking solutions that are widely used in non-western worlds, and that's likely a model for emerging economies. When electronic banking comes, OP is saying that standard banking ("perfected over millenia TM") is honestly quite preferable over algorithmic contracts.
Many of them can. Smartphones have much higher adoption than credit cards in these areas.