This is not factually correct - tuition at non-state schools increased 10X in the last 30 years, way ahead of the pace of inflation. College education is significantly much less affordable than it was years ago.
> "This is not factually correct - tuition at non-state schools increased 10X in the last 30 years, way ahead of the pace of inflation."
You are only considering the monetary cost of college which has, indeed, skyrocketed.
However a more significant cost in the era you are both speaking of was the cost of not working immediately after high school - especially when that same social class very likely had started a family, or had a family they were coming from that needed support.
People coming from a high SES background could afford four years of non-earning, etc.
The result is college is more attainable to people across the social stratum. And then degrees are less rare, commanding a lower premium while the people holding them have more debt.