Without prejudice to the work of teachers, the question in the title comes down to the question of whether one always needs a teacher to learn from. In http://www.hybridpedagogy.com/Journal/files/Pedagogies_of_Scale.html Sean Michael Morris and Jesse Stommel qustion the importance of the teacher. They call learning the product of learning relationships. But that is not necessarily a connection to a teacher.
Martin Koops points in http://ictnieuws.nl/index.php?ID=3453 the computer cannot replace the teacher. He cites the article on the book of the Besturenraad ‘The computer does not replace the teacher.’
I do learn things from books, and also of texts that I read with help of the computer. These books and texts are not given to me by a teacher. Or should we name all people you learn of a teacher?
I do not want to down the work of teachers. A teacher can be a blessing to a student. But apparently others can too.
In MOOCs the other students were my teachers as well as the organizers and the ‘real’ teachers.
The difference between Teachers and others is that the teachers have made it their profession to assist others and to influence in learning and others do not. There are many more professionals who want to teach.
(Image http://teacherboosts.com/ )