"The vast majority of students say they prefer print textbooks over electronic ones, and attitudes have not shifted markedly in the past year, according to the results of a survey by the National Association of College Stores."

Chronicle of Higher Education

Maybe they just see it for the scam that it is...pricing is still way too high for a license that expires and has no resale value.

Online education is nowhere near the marketing hype imagery used by Schools.

or you can force eTextbooks down student's throats via "materials fees" on their transcripts.