IF the whole world ban BTC at first BTC will Crash very hard but only for a few month, Demand will be increased while there will be no Legal Seller, All trade will go to undergrand and Black market and illegal traffic, sellers will start to selling BTC 50 X more than current price. BTC will be more expensive, As simple as that,
That was an answer for these who said BTC will die if whole world Ban it, So no BTC never Die.
There is no clear and right logic here if your reason to ban Bitcoin is that it will hit $1 million because the black market will be the one to sell it.
So you want people to go to the black market to buy and sell there? if you want Bitcoin to become illegal stuff then all the hard work we've accomplished in the past ten years will go to nothing.
And lastly who will call to ban Bitcoin when it is already everywhere, people will call you out of your mind if you suggest that it will be ban, you are ten years late to do that.