Not possible life without bank because many people need to borrow money from the bank and make their business, not available for borrowing in bitcoin and altcoin and then not have institution available for every one could borrow bitcoin or altcoin, now day many country have several bank kinds and give good service for every one to save their money.
Actually crypto lending is growing right now, so maybe we'll meet times when crypto could replace banks or at least live right next to banks (on the same credit card of one user)