That is not going to happen in our life times!! There are to many older people who do not trust much, let alone something they can not see such as Bitcoin. There are also to many money hungry people out there who are not willing to let the money from bank fees go away.
well most probably you are right about it, but i think with bitcoin everything is possible to be honest
A lot is possible with the bitcoin but I think that letting banks disappear is not possible, they are just so powerful and due to that its almost impossible to accomplish this ever.