Your projections are based on personal views that are not backed by any research, so I wouldn't see it as valid. First, there is already a cold or indirect war between these countries you mentioned and it has not led their currencies to become worthless. I don't also think there will be any physical confrontation between these nations since each of them knows the consequences of fighting war.

Second, I accept the fact that Bitcoin is neutral but it will become a global currency only if these nations accept it as legal tender. It is glary that every government wants to control the financial affairs of its citizens and Bitcoin will undermine this goal. So I don't see these superpowers embracing Bitcoin as a legal tender. Rather they will do everything possible to increase the value of their currency and Central Bank Digital Currency (CBDC) than to embrace Bitcoin.

I am just trying to figure out how Bitcoin will rescue the world in this predicted era of chaos. I think Bitcoin will continue to exist side by side with fiat because it is designed to be an alternative and not a replacement.