I think if bitcoin will rules the world maybe bank will be gone. Because why you use bank if the profit interest are low. Wjile saving in a bitcoin is huge profit.
Exactly saving in bank is really not have that much profit as much as bitcoin has, now people like to invest in bitcoin than saving in banks because it gives high profit than putting your money in bank system, now it is very clear to be seen that bitcoin is gradually taking rule over the world, and people have fiat on bitcoin than any other investment for sure, saving money in banks is now an old method of saving and it is now modern age for sure.