More BTC will be in circulation, more Alts will be in circulation, and more money will be in circulation as well. Thus more USD and other fiats will be printed. And the banking system will be making a lot of money as well. Because countries are now accepting BTC and relevant products and imposing huge taxes and fines on crypto users and crypto bad actors respectively. And in this, banks and governments will make a good amount of profit. Overall, banks will only make money while the user will withdraw or deposit fiat to crypto and crypto to fiat.

When banks will make money and when governments will make money then at individual levels of countries a single country's economy will nourish and grow and then one by one countries accepting BTC will increase its adoption and more money will be printed and more money banks and governments will make. Banks will stay there and BTC will not take the place of Banks. As they are highly dependent of each other at the moment.