There is a certain determinism in the lives of people and nations. The World Without The US host an interesting premise but fails in delivery of scenarios which might accompany the collapse of the US's foreign presence.
The ability of the US to continue embark upon endless foreign adventures such as the wars now pending is extremely questionable. It all boils down to a question of personnel, money and equipment. Eventually with multiple foreign adventures that bring in nothing but cause an outflow of cash, you'll run out of money or people or both, assuming of course that the determination to continue in the course of foreign adventures does fail beforehand.
The World Without the US does not consider the question of exhaustion of human and financial resources. The author of this video a foreign immigrant does not consider the difficulty the US government faces in recruiting and maintaining members of the Armed Forces or the lack of money to continue these costly adventures. How many years would the author be willing to serve to help man foreign adventures?