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.
I do not understand the rationale for your reasoning. Why should the price of bitcoin rise by 50 times if all governments ban it? Why should the demand for bitcoin after its prohibition increase if it cannot be legally used anywhere? It is quite obvious to me that he cannot have significant material value after his complete prohibition. In this case, Bitcoin will be almost completely used between people; there will be no rules for transactions. Therefore, theft and fraud will flourish.
However, a complete ban on bitcoins does not threaten him yet.