One day banks will accept Bitcoin as medium of exchange and accept deposits from bitcoiners. As soon as the world powers accept it as medium of exchange.
It will depend on what kind of laws are set on crypto in a country. If the government of that country puts it under a law where banks can make crypto transactions, then of course customers will get the option to deposit crypto. As crypto is becoming more popular day by day, it is certainly expected that banks will accept crypto deposits in the future. However, it may take a long time for people to get used to it and for banks to get used to it. Because not every country in the world has legalized crypto yet. So it still takes a long time for the issue of depositing crypto directly into banks to become a normal thing.