In other countries, the hourglass economic demographic has been in place for a long, long time. Basically the rich/powerful class including those who serve them consitute the Upper classes.
Then, a non-existent MC. Then, lower classs.
As China and India begin to develop an MC, the US is giving theirs up.
I have heard talk that some upper class folks want the middle class gone, stating that the middle class is just a pain in the ass.
Overall, my thought is that regardless of what the UC has done, the MC itself has a lot to answer for. We all buy Japanese, or otherwise foriegn cars, we buy Chinese or foriegn-made furniture, we don’t dig too deeply into where our appliances are manufactured, and so on. We hire illegals to keep our lawns or remodel our homes. All that helps to cut out part of the very class most of us here are part of. And yet we do nothing to correct it.