When you think that ETF is a thing already, it's true that banks becoming deposit places and even basically exchanges is not that far away. Exchanges make billions and billions everyday, it's a huge business, I am not sure how big, but I mean Binance alone makes 20+ billion dollars a year, and that's just one exchange, sure the biggest, but one exchange only.

So if you take all of them together, you will realize that they are making a lot of money and banks will want piece of that. Considering the whole ETF sga, it may not be easy to have it all around the world easily, but as mentioned before me, some are starting already. So if you wait a bit more, in the future, banks will become like exchanges for crypto world, specially for bitcoin at the start.