Paper money will stay forever.
Why? Because its easier to make than coins.
they are also easy to counterfeit than bitcoin or electronic payment, i guess they will eventually fade away slowly or reduced for only small business in the future
but also contains falsified bitcoins, because criminals always have a way to get the benefits they want, and it is not impossible that a bitcoin will also be duplicated by irresponsible people.
I think paper money and digital coin have positive and negative effect and both of them are complete in every day because not all state use the digital coin for transaction
