The government has the power over its own country and people that's why it's not impossible if they ban btc in their places. Unfortunately, if that happens then all users will lost their coins and all efforts, time and even the money used foe investment will be wasted.
Yes that is right, some countries have already banned bitcoin but i think their people still using bitcoin for different purposes. For example in my country the government has banned bitcoin, but still most of the people are using bitcoin, even the government is not treating them harsh. I think that very soon my government will reverse his decision.