Well according to them, bitcoin was will have a negative effect on their economy, its so disruptive that they really consider it  a threat and therefore needed to be eliminated as early as they can. So there will be a lot of nations that likely put a hammer ban just like what Indonesia and Bangladesh did. But for me, it will not eliminate the banking system, we still need banks and not everyone will go crypto's. There will be some old and traditional people who would rather saved and hold their money like a physical bank as compare to digital money like bitcoin. So its going to be an arduous and continues war and no one will emerge victorious. IMHO. Another reason that I can see if say bitcoin and crypto will take away the potential profits from bank. Imagine they will be bypass because we all know that crypto doesn't have middleman like banks to do transactions. Everyone is his own bank.