Very likely, especially now that direct transactions using paper money continues to decrease, paper money becomes a crime factor that is robbery, if there is no paper money of course can reduce the robbery in banks or to people so I am sure that no more than 100 years paper money will disappear.
indeed possibility is certain, but it takes a long time, because as we know cryptocurrency is still a lot of hackers, so the government is still considering a lot of things
You know right even using bank service you can still be hacked so saying that the hacking will prevent cryptocurrencies or another form of digital currencies will erase paper money is just doesn't make sense.
However the hacking in the future will seem to be really hard because the security technology will always be developed to its peak.