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.
to be honest anything is possible in my opinion and bitcoin can makes banks disappear in the future
That is just going to be possible if the government will recognize bitcoin. But as long as they are not going to implement and endorse the usage of bitcoin then it is not possible to make banks disappear by bitcoin. And instead if the government will see bitcoin as a threat to the economy they are going to make bitcoin prohibited enter to the country.
so you are in fact saying it is not possible.
because the government will never accept bitcoin because that would mean they should give up the power they have over creating paper money and that is a power nobody would give up.