A teacher is a life long learner, in fact, everyone should be a lifelong learner, but the difference between us ( teachers and educators ) and others is that we have no choice but to be life long learners. We can not stop learning for fear that we might be outrun by our students.
I agree! Open publishing is highly important, but having tons of low quality material doesn't serve any good. There should be some guidelines or measures that would ensure accuracy.
An interesting overview of the challenges that the open education faced in the last 10 years. The "Last mile" part emphasizes the role of a teacher in guiding students to the right resources available online.