I think every crypto enthusiast is scared of it,
Who wouldn't be scared when their investment and source of extra income would be illegal on their country?
If that would be illegal, you can still find a way to trade crypto as it's anonymous, you can send it from country where it's legal and let them do the job for you, actually you can always find a way if you are a crypto enthusiast. Maybe I'm just lucky that crypto is legal in our country but I'm pretty sure some other countries where cypto is illegal are still enjoy crypto in ways they can avoid getting caught.
P2P method is what will be used if any country bans bitcoin and people still want to buy and sell cryptocurrencies. Classic example is of India where p2p trades were prioritized after their government banned the cryptocurrency trading and buying and froze all the bank accounts of the companies that were doing such things and after implementation of the ban there was a huge boom in the p2p part of cryptocurrency buying and selling just because of the need. So, in the same way there would be another method made for such purposes once a country bans cryptocurrencies.