I think for now, it will not happen for we know banks are in the system of any government. It has a strong foundation. Maybe blockchain banking will evolved by it will not defeat banks as of now.
the government has not been able to recognize the blockchain system as a whole for certain regions, some countries have begun to seriously adopt the blockchain system for their banking even more so including online trading services that have worked with many trusted cryptoTheir juristical regulations have been legalized by a number of world banks, so just wait a little while for the blockchain to enter the world market thoroughly, especially developed countries.