well, it is impossible for government to ban bitcoin but it is possible to regulate it. government can make a law that can prohibit transactions and others but i doubt that government can ban bitcoin to the fullest since it is in the internet world. crypto currency and people such as hackers can easily bypass that prohibition of government just to access the crypto currency or another situation can happen like most of the residents of that country will change their citizenship just to access it. they will go to a country where bitcoin or crypto currency is allowed. which is fatal if that happened in developing countries.