Love it or hate our economic system works pretty well over decades. It by no means moves in a straight line, but rather ebbs and flows. The middle class American now has a much better standard of living than Rockefeller had when he lived just 80 years ago.
We have homes that regulate temperature year round, vehicles that go more than 40 mph and you can fly anywhere in the world in less than 24 hrs. Not to mention in door plumbing, electricity and a smart phone that has more computing power than all of NASA 40 years ago. So on this birthday of the USA, pat capitalism on the back, it's doing ok.