Definitely, Bitcoin can make the banks go bankrupt.
I live in Sweden and there is a lot of bank experts in the media saying Bitcoin is a bubble and it dangerous to invest as you can lose all money but in reality, they are just scared that their bank is going to go bankrupt.
There are services which bank provides not provided by bitcoin. But in future when bitcoin became the only crypto currency. They will provide these services more cheap than banks. In future bank will disappear soon. Because of its bad quality transaction and higher extra fees. When the bitcoin community wider they will understand that banks have high fees. So they will lose interest in banks. One thing that prevent banks from disappearance if they became partner with bitcoin.