IMO as long as the internet continues to work then for sure crypto will live forever, even if no one can tell what tomorrow might bring, crypto lives on the internet and we all know the internet can not be destroyed no matter what happens.
Bitcoin will continue to live through the remaining survivors, although it will really affect the amount of bitcoin in circulation cause alot of bitcoin holders could die during the war and their bitcoins will just be stuck in the crypto wallet with no body to crack it open and collect the bitcoin, it will definitely increase the price of bitcoin, cause they will be more buyers but lesser bitcoin in circulation.