Like several other users have said,  I still want to add that I don't think this can ever happen to Bitcoin,  atleast,  bitcoin has grown past the stage where we could ever imagine such kind of ban happening.
Atleast,  not while we have countries that have already adopted bitcoin as a legal tender,  and many other countries in the process to,  alot of quite powerful people, companies,  governments, institutions have invested heavily in bitcoin,  any government rising up to do something that hurts Bitcoin simply means hurting all this entities, and I personally believe that this kind of ban can not happen without this entities fighting back.