Perhaps you could talk about the benefits of face to face encounters, and how teachers have difficulty assessing your level of understanding when in an isolated environment such as E-learning. How Teachers cannot create a personal connection to the student, that would allow for a deeper understanding of the student, and more personalized help and attention.
Another point that could be brought out is the fact of social interaction. Speaking from experience as a home school student, E-learning is incredibly isolating. There is no interaction with other students outside of a little chat box.
E-learning is infinitely easier to cheat on. This website being proof of that.
Overall, E-learning simply isn't as enriching of a environment as public school is.