Classes should consist of teachers to monitor and answer questions and a large screen TV of the best of the best teaching the class. There are teachers who hit it out of the park and the Bueller....Bueller......Bueller type.
Your suggestion is also that of an educational outsider. Each class is different. The “class” that your “best of the best” is teaching on the video is certainly made up of individuals who are different than those listening to such a video. More often than not, such videos are shot with a class composed mostly of white suburban kids. Or even if they are not, those kids are not your kids. There will be different reading levels, different abilities to grasp the information, possible physical limitations which require modified instruction, questions kids might be too inhibited or shy to ask, lest they appear “dumb” to their classmates. So a classroom teacher has to know to anticipate these questions the kids don’t even realize they need to ask and answer them. The teacher in the video is not speaking to your kids. They cannot be pitched precisely so that Jose in the back row will understand or Leticia in the row by the window will put away her mirror and pay attention. What will you do, keep stopping this exemplar video to address these kinds of issues in your classroom? Will the fully trained and licensed teacher in the classroom be reduced to a servant or other inferior of the teacher in the video? Wow, what a great feeling.
The state of the art is, IMHO, www.khanacademy.org. This provides lectures and computerized drill-and-practice. The key point is not to put "a large screen TV of the best of the best teaching the class,” but - as Salman Khan urges - to “flip the classroom” by having each student view the lecture at home online, and dedicate the class time to one-on-one quality time with the teacher and the individual student. And/or, having the best students help those having problems. Khan says that his videos do not replace the teacher, but they can replace the textbook. Do check out the website.