I do think banks will try to switch to cryptos but they will develope their own coin not use bitcoin or any existing coin because they will want to have a monopoly on it and control it from the start.
I often wonder how well cryptos will do when bubbles start popping. I know that silver and gold do very well in crashes but nobody knows about cryptos because we haven't had a crash since cryptos were born. I only fear that not enough people even know about cryptos and that a lot of people will be hurt by the crash and be looking to take out any extra money they do have in cryptos just to get through the hard times. Among many things we also really need better on off ramps for cryptos to fiat and less volatility before average people would be willing to get involved in cryptos. I hope you are correct I just really don't know how people will react and that makes me a bit nervous because I do see the storm coming in fast and hard with our financial system.