The objection was probably the post's implication that those technologies could manage all or most courses.
> switch to ereaders
Unless they're seeing different ereaders than me, that kills most detailed and colored diagrams in science textbooks. Also makes the experience worse in many geography, history, etc. courses.
> abandon the practice of lecturers performing the exact same lecture term after term when a recording will do
Recordings don't pause to answer questions mid-stream. A chat room or forum is probably good enough for upper-division courses where students have probably learned decent learning skills, but even freshman college courses probably need a human available at some point. Suppose they could be restricted to study sections...
> move towards homework and exams that can be marked by a computer rather than by hand...
There go essays and critical thinking questions in every literature class, to start with. Also a lot of the more useful evaluations in my engineering and science courses probably couldn't be marked by a computer.
To be clear: I think Coursera and similar efforts are awesome, and are an excellent supplement to college educations. I think they could also manage partial replacement of a minority of college courses. But especially with typical college students, who are not self-directed learners, I don't think it's the kind of replacement that will help budgets much.