The executive branch has been usurped by the least capable and least patriotic person to set foot in our White House ever, but that just means our military will be used ineptly for a total of either terrible years. We are still a superpower, whether or not the current leader is capable of using that power effectively or even positively. That can change easily with more socialism, but it hasn’t changed yet.
The Founding Fathers provided us with a Constitution to prevent usurpers from becoming President. Sadly we ignored that Natural Born Citizen part twice already this century.