Well, TBH if anyone is in trouble in This manga, it is Japan. While they have a huge tech and military advantage, it is not that Japan has the resources to even maintain its forces operacional ( Japan is not exactly rich in source materials ) and even keep its population lifestyle ( say, Japan has next to none lithium thus no new cellphones or laptops ). Sure, they could go berserk for a while, but what would they do when their planes turbines needed spare parts ?