If they were serious...
...there would be some way of getting tested and obtaining credit. I'd rather see a consortium of schools agree to a series of uniform tests, along the lines of the AP exams, which would automatically confer actual credit useable toward a degree. For a start, schools could simply agree to accept AP exams for credit, without limitations. (If you don't understand my point, try to get AP exams accepted for credit once you're out of high school.)