In every business it's the same. When new technology comes up the existing businesses will evolve or die. And obviously new businesses will also rise strong.
Same happened with mp3 and music industry...
How come your example can be applied to banking industry.
Banking industry is so vast that even if crypto will be the new thing , still they will remained. But prior to that, it will be very difficult to erase banking system even for decades. Honestly most crypto users here have a definition what is bank just because of interest vs holding cryptos. It's not like that.
Banks are not designed just for saving the money scheme. It has many purposes and advantages. Im a crypto enthusiast but not to the point that I will erase what are facts and closest thing to happened.