Banks do not fear Bitcoin but fear the technology that runs it.

Bitcoin is supposed to work like a payment system but is too slow to compete with the Banking payment system. It is now considered more as an asset/commodity than a payment system. Assets/commodities are controlled and owned by Banks, If regulation comes into existence than the Banks will be able to control and own Bitcoin as they did for Gold.

So my friend, Banks never feared Bitcoin but, we as a community do fear Banks.