It's entirely up to us whether we decide to use crypto currency or not. Maybe in the future, if the government thinks that crypto currency is becoming a threat to the regulated fiat, they'd come up rules to combat this. They could ban the use of other forms of currency altogether, but where is the progress in that?
They are not going to ban Bitcoin. Bitcoin will "ban itself" because governments reflect the people and the value of money depends on
the majority, as this essay discusses. Thus whatever populist computer code that can compete with Bitcoin as a store of value will be favoured over Bitcoin, and its execution will be coordinated by governments. It is all too sad, but who cares; the freedom and the lesson heralded by Bitcoin is here to stay.