But here's what I see as the worst line in the story:
According to Martin, textbooks are “a 20th-century concept.” Teachers are now “finding their own resources and putting them on the website for students to access,” he said. “In almost every curriculum area, the investment districts used to make in textbooks is beginning to change.”Textbooks, at least the best of them, are a carefully designed sequence which thoroughly and thoughtfully walks students through the material and allows them to access the concepts and practice needed for mastery. When stumped, students can look back or can look at example problems to figure out which way to go.
I have absolutely ZERO confidence that teachers grabbing things ad-hoc from wherever can do half as good a job as even mediocre text books. It will leave students with no resources beyond the teacher's word.
I've had courses taught to me by the teacher, using a text book they themselves had written--or worse, a photocopy of transparencies the teacher displayed in class. I always hated it! Having two independent resources at hand is vastly preferable to having one. With a single source, there is no other opinion as to what is most-important, what should be stressed, what should be skipped or deëmphasized, there is no alternative explanation you can turn to when the first isn't working.
I find the idea that teachers are superior textbook authors, better than textbook authors themselves, to be arrogant and misguided.