Serious question: Doesn't that just define a new lower class? If everyone moves up to the middle-class, isn't that the new lowest class? Wouldn't the upper mi

Serious question: Doesn't that just define a new lower class? If everyone moves up to the middle-class, isn't that the new lowest class? Wouldn't the upper middle class from 50 years ago be pretty happy as lower middle class today? (I believe so) If so, doesn't that signify some solid progress?