The role of the teacher is already changing. From expert to coach and trainer.
With MOOCs this development has to evolve more rapidly. Coaches and Trainers will have to become Master Yoda's sort of speak. They learn to learn, but also are in control of checking the quality. The quality of the content that is provided by the world and the quality of those who finish the course.
Big Universities and organisations like Educause should focus on training these Master Yoda's. The builders of MOOC tools like Coursera, Udacity, Edx, etc. should provide the Masters with the senses (tools/insights) to check on Quality.