If this will happen in reality then we can't do nothing about it,its the decision they made but this speculation is far from the reality that this will realy happen,the ultimate mission of government is to see to it that the citizens of its state can have a better economic status in which bitcoin can provide it if people will embrace its purpose and as what we can see nowadays,people started already in embracing bitcoin so,government cannot ban it and there is no reason in banning it.