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One more time - free for all ≠ mandatory.
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Yes, but there'll be an awful lot of those I described, the young people who are unqualified for actual university education, but who will cheerfully sign up for four free years of dumbed-down subjects on someone else's dime.
Look, you can't have it both ways. Either you have education as an end in itself, in which case you do away with things like engineering and health sciences, and you limit it to those who can truly cope with the material. Oh yes, you also need to make it so that this non-training education does not require the students to take on lifetime loads of crushing debt or use up all their parents' resources.
Or, you go ahead and accept the dual education-as-end-in-itself AND education-as-professional-training paradigm that's been in place since the early 1900s, and you figure out how to make that time and money be worth something.
This gets into the advice I invariably give young posters on these forums who ask about majoring in music performance. I always say "If you and your parents can afford to pay cash for that degree, a degree almost none of whose holders will be remuneratively working in the field after graduation, and doing so will not adversely affect your long term financial future or your parents' financial future, go for it. But if you have to borrow a bunch of money, or use up all your parents' savings, you'd better go for something that will make you self-supporting and able to retire that debt quickly."
This goal of "an educated citizenry" is what was used 150 years ago to justify the existing public education 1-12 system. Rather than extending the government handouts for another four years, let's fix the 1-12 system so it does yield an educated citizenry. If you saw what my grandmother studied in the course of completing a high school edcuation, in a small rural town in Kansas over 100 years ago, she had an education equal or superior to most run of the mill BAs from big state party schools. And by no means did every young student even complete high school in those days; the general expectation was that after 8 years of schooling, the student would understand the basics of arithmetic, writing (and I mean the ability to compose a letter, not just form letters on the page), read any non-technical books written in English, manage their personal finances and run a small company's business if needed (a farm is a small business), recognize much of English literature, command a basic understanding of science as it was known at the time, have a knowledge of geography, and have a general understanding of the government, politics, and history of the United States and Europe.
That was what the run of the mlll eighth grader, in a farming community, who also had to do chores before and after school, was expected to know. Not at a deep level, but certainly to understand the basics of all these to a sufficient extent to conduct their adult life if they stopped school right there.
If you read biographies of people before the modern era of social promotion and fad-based elementary education, observe how WELL people with third-grade and sixth-grade educations could write a letter. Yes, their spelling was often unreliable, but they organized their thoughts, wrote cogently and with sense, and wrapped it up when the subject was exhausted. And they did it with clear, legible penmanship.
Now it's being said that since TWELVE years of instruction isn't sufficient, we need to make "college free for everyone" to try to get kids with SIXTEEN years of instruction up to where they were with EIGHT years, a century ago. I call BS.. Throwning good money after bad in a system that's broken is not fixing the system.