Yes, the loss of both by the US is going to be a big driver. It's infrastructure and social organisation are very 20th century and that doesn't work anymore. There are fault lines opening all over the place but the military remain supreme. Dangerous days ahead.
And yet the amount US spends in military and making weapons is greater than all other nations combined. China, on the other hand, is piling up all sorts of resources even when they have more than enough to go another 10 years. You know that something is up.
If there's indeed WWIII, then it is said, the impact of this war will be 40 times severe than last time (because of all the nuclear weapons) and both China and US may not exist anymore, since they will be at each other. US will be responsible for a lot of lives some fear and under the current administration, as they suspect this country will launch the first attack either in Iran or Syria. So far it’s all speculations by people who are observing all the events, but the first two elements are facts.