What if instead, educators spent class time doing and homework time for the watching of lessons/lectures. The other benefit of this is that these can be viewed and reviewed anytime/anywhere. The result is engaged students who can now spend their time solving problems and working with their peers.
This concept is analgous to the many screencasts and online tools we've created for all Rockstar PE students on our blog, wiki, YouTube, Photo Streams and screencasts to assist students in completing assignments.
Spend less time talking in class, and have students engage in problem-solving and learning outside of the class. That way you will have more time to truly engage and get to know your students thus resulting in a more positive learning environment.