A short critique of the Khan Academy

There do not appear to be any instructional designers or learning scientists or faculty developers working with Khan Academy, Udacity, or Coursera. The closest is a 'course operations specialist' for Coursera: "As part of this multi-faceted role, you will train our teaching staff to produce video lectures". It's all just lecture videos.

As a contrast, here are a few free, self-paced non-lecture-based courses from the Open Learning Initiative (the downside is they take millions of dollars and years to make their courses) https://oli.web.cmu.edu/openlearning/forstudents/freecourses