Instapundit (Harvard Law grad) has often claimed that it is not the college education which is of value to employers. Rather, it signifes that the person is probably reasonably smart and reasonably diligent, so that filters out lots of people.
Of course, this does not apply so much to STEM students.
However, as higher ed reaches lower into the IQ and diligence levels, the significance of the degree is diluted. WHY COLLEGE FOR ALL IS A BIG MISTAKE