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.
Only terrorist and idiots will use the bitcoin if it will be banned by all countries because if it will be banned, I am pretty sure that those users will be jailed and the government will closely monitor those illegal users and they will sentence them once they will be found.
All of us wants to profit but if it is against the law of our government then we can't do a thing but to follow the rules. So the chances that bitcoin price will skyrocket to 1m usd is only a dream because the demand will surely goes down and only few will remain, meaning the supply of bitcoin is greater than the demand.