I'm not sure if it will be bitcoin but cash will definitely be replaced by a crypto currency step by step - it is then the complete surrender of freedom because every payment will be controllable in the future with all the consequences that arise from it. That's how people want it, so that's how it should be. People do not want freedom, they have only wanted bread and games for centuries. Electronic money (in whatever form) certainly has some advantages, but also disadvantages that are not publicly mentioned. I hope the people and especially the younger generation are aware of this.
There is a saying from Mark Twain: "History does not repeat itself; it rhymes!" This should make you think ...