if many governments declare it illegal because they are afraid that the control system they have is over and resides in people and not in institutions, they will be able to prohibit it but always open an illegal market that will subplant it so that there is no one to stop it. there are many banks that invest large amounts of money to give false bitcoin news also they compan and break into the market making attacks with massive sales to make you lose confidence in bitcoin but bitcoin is very strong