Jerry Pournelle, writing on the subject of Roman Warm, Dark Age Cool, Viking Warm, and I’m taking the day off has this to say about a "Dark Age" and Public Education:
What is certain is that something horrible happened in 535 which ushered in a long period of cooling, shorter growing seasons, plagues, tribal wanderings, and the real Dark Ages, if you define a Dark Age not as a time when you have forgotten how to do something, but have forgotten that anyone ever was able to do it. As with the US in education, where we have forgotten what we used to accomplish with the public schools, and now strive to achieve goals that would have been considered failure by most teachers over most of the period of the public schools.
When future historians write about the history of the United States, the idea of government controlled, tax supported education will rank among the worst ideas ever.
Assuming the looming Endarkenment leaves mankind a future that can afford historians.