The Chronicle of Research Services issued this report: The College 2020: Students. Although from 2013, it has a great section on a poll from students who identified the rigidity of University learning was stifling them. Their suggestions included customizable text books, mobile learning, and self-directed curricula.
Enrollment in Distance Education Courses by State: Fall 2012 from a USDOE Web Tables report from June 2014. Interestingly, black and native American colleges offered the least number of online courses.