I don't think it can... Rather I would predict to be a co-existing situation with bitcoins and banks. For example, I am using HSBC while I am using ANX, no conflict with each other.
That's how it should be as banks and Bitcoin can perfectly coexist alongside each other.
There is simply no need for Bitcoin to get rid of banks. We need them.
Yeah let both of them work for they are meant for, both have their own advantages and disadvantages, let people choose what its the best option for them.