Regarding to the topic,
If bitcoin build a headquarter bank, then the identity of bitcoin will not be the same as it is right now.
It will surely be implemented of having tax of bitcoin into its respective place where the HQ is built.
We all know that nobody owns bitcoin, (correct me if I'm wrong).
Maybe it is possible that there will be a bank supported by bitcoin payments.
Well as for as my opinion is concern so I think if bitcoin make headquarter bank so I think bitcoin can be increase with high price investors, traders and other people can be very high as well and it will be more easy for all investors to keep their bitcoins with them which will be more secure and I think that bank can also provide them some extra services like credit or debit cards.
May be it increase, when the bank works for the benefits of people, when it provides facilities to people. If Bitcoin headquarter bank draws hard terms and conditions for people so then, what will be the difference between current banks and bitcoin headquarter bank. People like bitcoin because it totally free of hard type terms and conditions.
I think bitcoin should be improved and bitcoin headquarter bank should be established if policies are not against the bitcoin holders.