cryptocurrency wants to end the banking system why banks embrace it? You really will kill yourself if you are a bank, decentralized cryptocurrency and centralized banks are at odds with each other.
Using Bitcoin or other digital currencies will really make banks useless since with digital currencies, you can manage your own balances, your own digital currencies by yourself. You do not need other people to do that for you since you can do it myself, but there are still banks that embraces Bitcoin and other digital currencies. I think it is because of its great technology that can be used by them.