Just crossed my mind today. Will it make sense if someone will create a paper money equivalent of bitcoin? And the coins will be the smallest unit of bitcoin, Satoshi? Like the currency today? I think it is okay if it became a globally accepted currency. And it will serve as a payment for everyday goods. What do you think?
If you mean to print a wallet and the keys to it on a piece of paper and use that as payment like a dollar note, that will not work.
The bitcoins are still on the blockchain and everybody who gets that piece of paper will have all access date to remove them to a different address.
Very soon the coins will not be anymore on the address shown on the paper, so the paper note becomes worthless.
It is possible to hide the keys in a way that destroys the note or otherwise reveals the key has been broken into in order to reveal it, the same way casascius coins and newer designs work.
It would make money much more difficult to fake as well as anyone could check the public address if in doubt to the notes authenticity.