I think that crypto and banks must be separate!
Im not sure that you are right about banks and crypto. If they will be in touch it can make life little easyer) If you have 10m dollars in BTC, how will you take them out? You wont find a bank which will let you deduce such amount of uncler money. Correct me if i am wrong)
There is no problem to convert cryptocurrency to clear fiat money by bank. Only thing that you need is the country where cryptocurrency has legislative regulation. You just put your crypto to any exchange where you have full verification then convert it to USD and withdraw it to your bank account.