I don't believe in conspiracy theories, but if we agree with you that the world is on the brink of world war 3, who is going to care about BTC then, there will be other things on your priority list, like staying alive and getting food to eat, you'll want to have only fiat then because nobody is going to be exchanging their fiat for your BTC's, so you can't even spend it. So we better do something to stop that war if it is truly coming, to save ourselves and not BTC. 
If you are only holding fiat in a situation like this, you'll be having a tough time. Precious metals?
It's not a conspiracy that ww3 is on the brink of happening:
https://www.bu.edu/articles/2022/how-close-are-we-to-world-war-iii/
https://www.washingtonpost.com/politics/2022/03/17/why-biden-white-house-keep-talking-about-world-war-iii/
https://www.businessinsider.com/conflicts-that-could-turn-into-world-war-iii-during-2023-2023-1
And it hasn't gotten any better -- North Korea fires intercontinental ballistic missile after threatening US
The reason everyone is trying to prevent ww3 from happening and talking about it is because it's close to happening, i.e. on the brink of.
The conspiracy theory is [essentially] that there are superpowers [intentionally] creating various problems to send us here.And you don't have to convert your BTC to use it, there are plenty of places that would continue to accept it as payment even with ww3, but BTCs potential would certainly suffer, as things like electricity, internet are targets for these wack job globalists, and yes people will prioritize survival, but BTC should still exist in some capacity.