> One downside to this model is that for some courses, like those with rapidly changing content, the lecture videos can go out of date after a year or two. Isn

> One downside to this model is that for some courses, like those with rapidly changing content, the lecture videos can go out of date after a year or two. Isn't that the case for almost every course, though? Curriculums take years to develop and change, and it's always easier to just reuse what you already have.