I know little about Iran, but I do consider myself an expert on the US, and I tend to share his pessimism about the American future, although perhaps for different reasons. The USA faces some potentially devastating problems, and even though I firmly believe they can all be overcome by technical means, I'm not confident the nation will succeed in doing so for social reasons. (In no particular order).

1) Over-reliance on foreign energy supplies in general, coupled with energy-wasteful economic practices and an economy addicted to them.

2) An abandonment of its industrial base and over-reliance on foreign manufacturers for even the most basic industrial commodities and products.

3) A population with increasingly less education, particularly technical education.

4) The shift of the distribution of wealth from a roughly Gaussian mode to increasingly smaller percentages of the population at the high end is potentially devastaing. As long as overall wealth continues to increase, this dynamic is not readily noticeable. But if total wealth were to decline, without the distribution shifting back to the center, social unrest is highly likely. The glue that holds this nation together is the general belief that tomorrow will be better. If that goes, all bets are off. Americans will not only not tolerate being poor, they will not accept any significant reduction in standard of living.

5) Uncontrolled immigration. This country tolerates the immigration it now has because immigrants are still not perceived as a threat to most of our jobs. This will lead to civil strife and division. When programmers and managers start losing their jobs to foreigners because Americans no longer have he education to do them, look out.

That's enough for starters. I'm too depressed to go on.