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.
True i believe there will be a need of for paper money for decades to come. Sure things are getting done mostly online.
But some things can't be done online and for that we need paper money.