The point of the article is that the meritocratic system in this country is broken. In part this is because we have systematically transferred wealth out of the bottom to the top. For example, focusing on tax cuts that benefit high income individuals while cutting support for public colleges. These two things are usually done at different times with tax cuts usually to stimulate the economy and spending cuts coming t…
It's unclear that the mechanism you describe behaves as you claim. Supposing that it's true that a college degree confers (typically, on average, whatever) an extra million over a lifetime career, what would happen if everyone did attend college? Would that effect remain? If college educations become more common, they also become less scarce and valuable. You talk about how affordable it was in the 1960s, but this is…
The reason why education works is that it makes all parts of society function better. Having an educated population produces a higher functioning society. That's a society that, more often than not, is able to produce more wealth faster. In fact, it's in the enlightened self interest of society to have a broadly educated population. Basic research winds up driving GDP growth as science goes from the lab to products. Having more engineers and scientists is important, but so is having musicians, writers, nurses, and so on. All these types of education are important in a modern society. What's going on in the United States is that we are slowly short changing ourselves by making it harder and harder for people to get that additional education.
But in the process we're also creating a more stratified society. A lot of social mobility comes from the "first generation to go to college." By making college education less affordable, we keep people in the lower and lower middle classes that could have a transition up the income ladder from lower skilled, lower paying jobs to white collar professions. That's just one way we're becoming a society with little social mobility. American has moved away from the meritocratic American ideal. Now, even if you're an idiot, if you start out rich you'll probably stay rich. If you're poor, even if you're smart and capable, you'll probably stay poor.