And because whatever diploma issued by such an institution would be largely worthless, enterprising folks might get together and offer special classes where those completing K-16 could go to become educated and obtain skills required for meaningful employment. Of course, not everyone would be qualified to take such courses...and those enterprising folks would likely charge special fees for taking those courses...and if you really needed to take such courses but didn't have the money, enterprising financial institutions might offer a loan to you...and
LOL - yes, reinventing a sane university system...