It looks like paper money will decrease in the future. Financial institutions also continue to innovate to facilitate the public in the use of payment instruments, credit card is proven. Something that was once rejected by financial institutions.
In highly developed countries, the amount of paper money can really decrease, if there is no collapse and there will be the development of electronic payments.
yes no doubt that its use can be decreases but i think we cannot quit if for ever. even in highly developed countries people will always be using proper money. may be their first priority will be change to to bitcoin but they will also fiat in different places. for example in my country very little people have the ability to use bitcoin most of the people even do not know how to use it, therefore the are still using fiat for completing their needs.