As Internet and email destroyed work of post offices about letters sending as Bitcoin will destroy banks system about using money. That is my opinion. And I'm pretty Shute that it is going to be as u say - bitcoin or maybe any other of crypto currency will be used mostly by people.
The banks are not used to send money. They provide borrowing and lending service. With bitcoin, they will make more money.
You mean to say you cannot transfer money overseas from the banks? No mate you can send and receive money in the form of telegraphic transfers and wire transfers, but charges are too high.
He does not means that banks are unable to send and receive money overseas or in the country, but he mean that the duty of bank is not only to send and receive money but lending also and borrowing money to people also.