I don't think it will be new thing if it will happen because i know very well when the one of the state of the Russia banned the bitcoin and the price of the bitcoin get down to about 140$ down ( from 500$ to 360$ ) .
But at that time many people were in my contact and were selling Thier bitcoin for money in dollers at PayPal like platfroms .
So i don't think that there we will see any down in the price more than 10-20%
And if it happen in the current time then i am sure that people will not get in fear because most of the people knows that how they can handle bitcoin easily in the offline Market .
Here if you will make research to mske buy sell bitcoin in offline then you will easily get places , so just forget about every negative thinking and use bitcoin blindly for the earnings as well as for saving purpose because your money is your and if you can access internet then you can access bitcoin , so why to take fear .