What do you think? Will people still use crypto in a country where it's prohibited to do so? Or will they be afraid?
So much depends on the penalty, and how serious the government is in implementing and cracking down on crypto users, if there is an imprisonment and a huge fine, I don't thinkk people will take the risks, he might as well go underground or get out of that country, it's not worth the risk holding crypto.
What if all of the world's countries turn against crypto (which is very unlikely atm)? Will market prices go all the way to $0?
Since you've used the word all there is a probability that it will go to zero, but it still depends on the risk the holders will face against the country where he is located.