There was An Interesting Study/Findings published by the Pew Research Center which focused on The Digital Revolution in Higher Education. You can see the full report here.
The findings show that a small percentage of people feel that online courses offer the same benefit as face-to-face classes. But, the majority of college presidents feel that online courses offer the same benefit. Even though the report is centered around higher education, I feel in the very near future there will be a much higher prevalence of digital textbooks and online learning in our public schools.