The scenario that can make bitcoin crash is when the internet and electricity on this earth are destroyed which we will not see that thing happening in the near future ( I hope so). Because basically you need electricity when transacting with bitcoin, miners also need electricity so that your transactions on the blockchain can be verified by them, the internet needs electricity too, the point is electricity.
Cutting the internet forever is enough to crash blockhain. Without internet, most of technology will be useless but of course cutting the internet has 0% chance of happening. Rich countries will always fine a way to keep it alive. I don't know what came to op's mind and think of such impossible thing to happen within this era. We are in 2020, and I guess it's safe to say that blockchain technology will remain it's existence even in the near future.