If the internet survives then cryptocurrency will survive.
Doubt it.
Even if the internet survives, what benefit can bitcoin give? The main benefit of internet is to facilitate communication and make deal (exchange). The actual exchange of good still requires unrestricted border movement and transportation infrastructure intact for it to happen.
In a total war scenario, one can not buy basic necessity 200 miles away from where one is.
Agreed.
Considering the South Hemisphere which there is almost zero movement in Bitcoin economy because of taxes and exchanges to get USD, THEN trade in bitcoins, in a world war scenario the prices would dramatically fall if this war affect the big portion of the net. But thinking in South America, especifically Brazil, these same countries just entering in the crypto economy, all pacifists, there's a a way to save the network, imo.