As such, what do you think will happen with Bitcoin if all the governments of the world ban it?
There is no possibility for ever government from around the world to place a ban on bitcoin or cryptocurrency. I'd you have been listening to the news you would find out that most countries are accepting bitcoin
Maybe the question is only if that thing happen, because when there is bad news about bitcoin, it does not rule out the possibility that the government has previously supported, make bitcoin illegal in their country. That is why it is actually depends on all of us as holders to support it and not use it into bad thing.