What do you think? Will people still use crypto in a country where it's prohibited to do so? Or will they be afraid?
It depends on how you take the risks. If there is a prison sentence, I don't think I can take it. If I'm a prominent investor, I prefer to get out of that country and go to a country where I can invest freely, and I have a chance to be financially free
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?
If it's only the government and the general public are still supporting it, I don't think it will go to zero. Bitcoin started with zero support from the government, and look where it is right now.