Yes op, you make a good point by saying bitcoin will not eliminate bank. Bank have play a lot of activities that is making bitcoin to continue spreading globally because many people have converted their bitcoin to fiat to get whatever they want from their country, without using bitcoin that is not allow in their country. You can save fiat in the bank and other documents while you can only save your bitcoin in your wallet but you can't save other documents in your wallet, which is the reason I said bitcoin will continue existing and bank will also continue existing for people to make use of them to achieve their purpose. Since, we know that the founder of bitcoin didn't created bitcoin to be into competition to eliminate bank, I don't think such thing will happen to bank because it's government source of income.