This is pretty spot on. In the mid/latter half of the 20th century, most people who thought they should have what they thought was the good life could get it. It's less about "you didn't need 2 incomes" and more about "culturally, people thought women should work in the home while men worked outside it".

Now, it's not really even clear what the good life is, but whatever you think, it's very hard to get it. Schools, commutes, quality housing, health care, stable income, they've all gotten far, far worse for almost everyone, and there's nothing they can do about it.