But eventually middle class people will get priced out of quality as well, as the market for them continues to shrink and optimise for cost. Soon enough only up

But eventually middle class people will get priced out of quality as well, as the market for them continues to shrink and optimise for cost. Soon enough only upper middle class wages will be good enough for a median living in the US, and the middle class will just be living comfortably poor. In any strong middle class country I have been to, services, food and transport are all high quality because that is where most people exist in that country. There's competition for that market and rather than having to compete on price because everyone is poor, they can compete on service and quality while maintaning a fair price because people value that more than cost optimizing.