You realize the middle class is shrinking because they are becoming the upper class right? Meanwhile the average household size has dropped (Grandma and Grandpa

You realize the middle class is shrinking because they are becoming the upper class right? Meanwhile the average household size has dropped (Grandma and Grandpa now have their own digs), ownership of luxuries has exploded and even car ownership is way up. What, precisely and concretely, is getting worse?