Although some people in the forum argue that there is no risk to the global financial system from bitcoin, banks do not have the same opinion. For example, BNP Paribas admitted that bitcoin could destroy the banks as we know they work now. More over the BBA which is the leading trade association in UK has circulate a document with title Digital Disruption UK Banking Report has a paragraph about the threat of bitcoin in the future and  concludes that bitcoin "users handle many of their daily payments needs themselves, without the need for interaction with banks". All of these which anyone can find with a simple search like as more recent examples of other banks like as the PBOC are signs that banks are already considering the bitcoin as the enemy. The future will be interesting.