There is no longer any room for doubt that we are living in a plutocracy, not a democracy. And according to a recent NASA study, that is a prime indicator that we are a society on the brink of collapse.
US might be a plutocracy, but not a society about to collapse.
US has a great middle class, and even with the current crises, they are yet to get into lower class/poor. And even when you are poor, you don't starve.
Unless a huge shift occurs and the current middle class starts starving the collapse you are worried about won't happen.
The Arab spring occurred in countries where the middle class was not really strong - in numbers and social indicators. In Tunisia a man self immolated out of the tragic circumstances of not being able to feed his family. This seminal event kickstarted the uprising.
Saudi Arabia for all purposes is ripe for spring cleaning, but the middle class gets a lot of handouts from the rulers and they get fat and lazy. So there will be a lot of diabetes and heart attacks, not society collapsing.