You’re saying this like you have not heard about banks’ digital currencies. Even the exchanges you’re saying we are going to rely are making use of banks. The money you send to them when you’re buying Bitcoin doesn’t just disappear into the thin air, it goes to their banks account, what they are doing is a business and they are making use of banks.
Unless what you’re going to say is that a lot of people are going to start making use of exchanges and also making use of crypto private wallets. We are yet to know what the government will do when they are done creating their own.