Happy to see that this thread is not locked.
I think this topic, like most of life, is about perspective. Most middle class, heck I'd even say many people considered poor today have luxuries that were unheard of 50 years ago. If you want to live by middle class standards of 50 years ago, you could do so on a very modest wage.
But that isn't enough for people today. They want to meet the new standard, the bar has been raised. They want bigger houses, nicer cars, more entertainment. They want to keep up with the Jones's.
We've traded simpler lives with simpler expectations for ever increasing complexity and expectations. And there are tradeoffs involved. If you want to lead a simpler life, you can- but don't expect to afford all of the modern conveniences on a modest single wage. Think of how many bills the average person has today vs. 50 years ago. It all adds up.
There are a couple obvious areas where costs increases have drastically outpaced means, at least in some areas. I don't think it's a coincidence that forces meant to increase access greatly contributed to increasing costs. Education, housing, and healthcare come to mind.
I'll address housing, since it is a timely topic as I just bought a house. This is my second house. I bought my first house in 2003, right in the middle of the up slope of my market. I bought an entry level house, because it was what I could afford then. A very modest 3 bedroom, 1300sq. foot house, typical of a middle class home when it was built in the 70's. I could have bought a much more expensive house. They were giving away loans like candy back then, and most people I knew of similar means were skipping the starter house and going straight to their dream homes. Which became nightmares when the bubble burst. Meanwhile, I was happy with my starter home, no stress, no threat of foreclosure.
Fast forward to today. Three kids later, the house is feeling a bit small. But since I've been living well below my means for the last few years, I'm ready for my dream house. Not because I deserve it, but because I've earned it. But I still bought within my means. Not what I could afford- I looked at some ridiculously nice houses, but they would have been too much of a compromise in my opinion. One step at a time.