Paper money will ofcourse exist in the future. But you never know what can happen with the digital money and that is quite risky.
I hope that more people will also use some Bitcoin, that will be good for the future, and paper money will always used.
Yeah, I don't see any threat to paper money from bitcoins, as the users of paper money are in huge proportion, comparatively very few people are using bitcoins at present.
I think the paper money will not long last for the long period of time. coins and paper money will start at left. halted the use of credit or debit card or atm. or can we call digital.