Textbooks (and newspapers) evolved in a value chain economy. Real life happens in a user network economy. Learning happens when just the right content in just the right form is inserted into just the right space/time. The right space/time for learning is defined by the yellow circles in the second illustration.
Print is the best artifact for learning in a specific space/time.
Thanks to ed4wb the illustrations.
Learning in a value chain economy
Learning in a facilitated user network economy
To see more about how I think this plays out for the value of Print in general, check out my post at Digital Nirvana. The title is Print is better than the web. Discuss.