For me, in this generation, it is really not gonna happen that money will not be used anymore. Since all of the people are still relying on real money. Whenever a person is employed, he/she will be compensated with real money. And that only there are only few countries who's accepting bitcoin as a payment. Though it is still possible, but maybe not in the near future.
Right, now, Bitcoin completely replaces banknotes. This is almost impossible. For every country in the world, they cannot give up their own legal currency and instead support the cryptocurrency. If there is this trend, I think bitcoin death is the ultimate result.