Why, to instruct, the teacher uses audio and video supplements. Perhaps also the Web. The teacher must be very familiar with technology. This is the current format expanded by the use of technological gadgets. It's nice for the teacher to be knowledgeable, but one can get by preparing for individual class meetings.
Requirements imposed on the teacher grow tremendously.
As it may not be very predictable what a student will fish out from the Web, the teacher must be really knowledgeable to be prepared for every eventuality. I do not know. It's likely that the two will somehow blend. Regardless of what actually happens, it is clear that technology will require more knowledgeable teachers. With technology in the classroom, students will ask more questions.