> can blockchain technology or more generally any other not fiat money help somehow the situation?
Yes it can, but existing governments will not cut off their own limbs (give up their current power over currency management and tracking) by adopting a true blockchain.
right now we have US ( and dollar ) hegemony. What if we will end up in multilateral world. What would be the new currency if no one will win current wars?
There is the possibility for there to be a non standard valuation. A few decades where neither the US or another currency is dominant. Personally I still see the US dollar as having a lot of strength but that can change surprisingly quickly once the flip happens.
I'm not worried about that at the moment but I have said, once the US dollar is no longer accepted at a random Thai street market that is when the US dollar is done.
