I do not put much into the idea of one American president to run the show similarly as it happened in some totalitarian countries around the world. While there is no denial that some people envision having their favorite choice to have this power to squash opponents, it is unrealistic within the political system of USA that survived such crisis like the Civil War and the Great Depression. What is more worrying is the trend, where the American society is heading, which has far more reaching legacy and lasting impact. Trump's big mistake could be destruction of the NATO and USA military standing which itself is worn out by GWB war legacy. Americans after they broke off alliance with France in 1800 until 1942 refused to be part of any, and lived in delusion of isolation until the WWII. Trump is feeding on the same isolationist delusion of the long lost past.
The decline of the USA is already in the second decade of making. Today I saw a chart that plotted car sales in USA since 1951, and we sell 40% less cars than it had in the peaks 30 years ago and less than it was in 1951 when USA had the half of the current population. This only showing a decline of the purchasing power of the American consumers. After inflation, USA incomes are in the 1990's level. Therefore, if anything, the US policy after any election would have to undergo through economic restructuring and reformation while at the same time addressing a needs of Gen Y which is the biggest demographic in the country and its voice was neglected by shrinking Boomer population. I do not see any of the candidate have any ideas what to do, and I frankly do not think that Hillary or Trump even care.