I strongly disagree with what the expert says. We still need bank because business borrow money from them as well as ordinary people to purchase their home or even a car. Bitcoin would only be a type of currency that we use to buy.
People always need banks. Bitcoin might really be a nice currency and banks might really make a copy of its technology.
What banks can offer us now, they can still do it in the future. Despite of the reality that bitcoin is surging now, we still gonna use bank in the future as bitcoin is always dependent on the value of fiat. They had to eliminate the government to make bitcoin an independent currency which I think will never happen.