Absolutely banks play an important role as the country's economy and now no one country that do not have banks. Bitcoin can eliminate banks is quite impossible because between the two I think is very different and has no effect on each.
Imagine a situation where all would enjoy only Bitcoins and stopped working with the banks, the financial institutions, would certainly have collapsed.
On the other hand, in reality no such a scenario does not address. The banking sector are concerned primarily not Bitcoin but blokchain technology. It's no secret that banks are accustomed to constantly receive some income from the change of the owner, so imagine their functioning without such a source is not possible.