Imagine, if banks are using a bitcoin wallet, issues a bitcoin card (in a form of debit, savings card or credit card) with private keys on back and public keys

Imagine, if banks are using a bitcoin wallet, issues a bitcoin card (in a form of debit, savings card or credit card) with private keys on back and public keys on front, the bank then deposits money into the wallet then the end user withdraw money with the same bank or supporting banks. This is one of the scenarios I think that would incorporate bitoin into the current financial system.