I don't believe they would ever go for it because it's against their interests. Of course, they might impose some restrictions, but that, in turn, might lead to some further reaching consequences, IMHO. Remember, Russia tried banning Telegram messenger? Did they succeed? Nope.
Speaking of the BTC price in the adverse scenario, something tells me things that are banned are, ironically, more expensive, aren't hey?
However, I might be wrong