It doesn't even have to be a card-shaped anymore, since it's NFC. There are other form factors that handled real-word payments, like bracelets, watches and phon

It doesn't even have to be a card-shaped anymore, since it's NFC. There are other form factors that handled real-word payments, like bracelets, watches and phones. All of those can be easily equipped with a display (enough to show a transaction amount) and some sort of sensor (keypad, touchscreen, single "approve" button, fingerprint scanner) to handle user authorization. This will probably break the "fix" though, as the "card" may take up to tens of seconds to "respond", awaiting for owner granting permission. And won't work for stores that can't handle NFC.