It seems the OP is asking the future of Bitcoin and the Banking finance and to be honest, Bitcoin and Banks relationship has been on the rise more than 10 years, you need bank way to sell your coins into fiat. Some banks have Bitcoin custody but we have more of them coming now. Take a look at Robinhood, they bought Bitstamp exchange and where do you think that money is coming from, from their traditional finance to fund cryptocurrency and this is because they see it as the future.

The banks need Bitcoin same way the Bitcoin needs the banks but this adoption isn't going like that, they are all afraid to buy real Bitcoin. This is why many of them has decided to buy Bitcoin coin ETF instead, this is what Blackrock who are asset managers to many banks are doing with Bitcoin right now, it's obvious they all want to have Bitcoin but are afraid of the government.