Although printed on paper money, I think it's more worth mentioning as a member card that can only be used in one place
The initial expectation of bitcoin creation is that it can be used as a global currency, and bitcoin should not be tied to institutions why you make it more complicated by organizing it by signing up for membership before you can use bitcoin directly.
Banknotes can be used but I'm not sure will it be used as an entire banknote or it will be a digital wallet that will have balance inside it and this banknote can be filled?
We are already tired of the bank notes and that's why we shifting towards bitcoins and digital currency to keep ourselves free from the banks and physical notes stuff. There is no need to again go back to old tradition and thinking of making bitcoins notes. Our focus should be on the development of more secure and easy to use wallets and how to keep safe our digital currencies.