Well, that's the worst nightmare for all who still holding bitcoins. All of the btc invested and all of the btc still inside your wallets will become valueless all of a sudden. All of the effort, time, and sacrifice tha you do just to earn will not give some benefit in return, it's like you're in the highest peak of the mountain then you suddenly fall down to the bottom.

I think the only way to avoid thia misery is when you trade your btc into other cryptocurrency before the ban and withdraw all of it to cut the future losses. (I hope this won't happen)