Unless grocery baggers are hired based on their lack of education (ex: 8th or 10th grade being the last completed), we're already massively wasting education. They are not using any skills they have in any subject taught in a school that cannot be taught in five minutes. However, most of these companies require a high school diploma, GED, or similar, for a job requiring none of the implied skills.
There's no reason that the VP of Manufacturing in my company refuses to hire anyone without a BSME to work as a clerk managing paperwork that comes from Engineering, but they always fill that position with someone with a BSME that eventually leaves unless we poach them into our department first. However, it does prove that their employment options are limited even with a STEM degree, so they're willing to make $28k/year doing something that technically doesn't require their skills just to get their foot in the door somewhere. The mentality is spreading, with many other menial jobs within the company requiring as least a 4-year-degree in a STEM field. Our Field Service department recently started demanding a degree for glorified plumbers and their secretary has a masters in some hard science field.
Nothing opened my eyes to the situation more than this. It's clear that degrees are moving downmarket.