If world war happens, crypto will collapse because internet will be badly affected, there is only war between 1 or 2 countries then the fiat pouring into crypto will be huge.
I don't think the scenario would be like that because the internet is not controlled by one person...
the world war that is likely to occur in the future will not make the entire world go to war, only a few will war. and maybe the Bitcoin price will go up instead of down because it's been confirmed that there will be many who secure their assets, Who knows.