I think the idea of bitcoin bank would not be good for the development of the bitcoin, we all know that the presence of bitcoin can shift the bank thereby giving the freedom to do anything.
I don't believe that bitcoin bank can be a hindrance of freedom to do anything, because having bitcoin banking can be advantage with bitcoin to be more secured. When we talk about development of bitcoin shouldn't be limited to a certain point that banking system is not connected, because banking exchanges was now happening in the bitcoin economy, and I've observed a lot of profit that everybody has now experienced through cashing out from banks connected from blockchain exchange network.