Whatever banks do, they will not lose the trust of some people, because the meaning of the bank is authority, the meaning of paper money is the trust given by the state. Western European countries with strong banks are in a different situation. In the Middle East and Asia, they have been exposed to many bank frauds over the past 50 years. As a result, the bank's hand is strong.
So the conclusion to this - the banking era will only stop when current "grownup" generation will extinct.
Statistics shows that most of the crypto market usership age is below 27 or something.
Answering the main question tho - crypto is part of global economy now as well as banks, so there is no clear correlation between loss of one and gain of another
I believe that everything will happen exactly as already said. The fact is that many old people still have not even learned how to use bank cards and continue to prefer cash and I do not believe that they will understand crypto. But how many people will be able to use cryptocurrency today is generally very difficult to say, since the use of cryptocurrency requires certain knowledge to use and store cryptocurrency funds. But I believe that the situation will improve with more education of people, if, together with the introduction of cryptocurrency in a person's daily life, the corresponding knowledge will be taught even in primary schools. I believe that the situation with cryptocurrency will resemble the situation with the computer and the Internet, when with the growth of computerization all over the world, computers began to be installed even in rural schools, since this is a requirement of the modern world.