Interestingly, that's already kind of available in some countries. I live in Austria, where we have a system called Bürgerkarte which utilizes PKI. One of the s

Interestingly, that's already kind of available in some countries. I live in Austria, where we have a system called Bürgerkarte which utilizes PKI. One of the supported options are ATM cards (others being public health insurance cards, mobile phones or "real" smart cards). Unfortunately, it's not very widely used and quite complicated to set up. This would definitely need to be an international effort to become viable.