This has already happened. Tens of millions of people trust cryptocurrencies more than banks.
Can you back this with a valid support, I mean something that is based on studies?
And over time, this amount will increase to billions. Then we will see that banks will cease to occupy a major position in the world and they will have to coexist with cryptocurrency
I believe this is likely to happen, in the long run there will be massive adoption as crypto will not go away, in fact the government are recognizing it and they are starting to regular it, we can wait for that time and people will be using more on online transaction than using paper money.
Bank might still be here but with limited function only as their main function which is to accept deposits, process withdrawals, and fund transfers can be done with blockchain or crypto in a decentralized way.