In my work as an educational technologist in Higher Education (and with academic/teaching experience in HE) I am more frequently receiving queries and requests from teaching staff who want to make a video of their lecture so it can be available to their students on their module site in the institutional VLE.
Great point about video not being always necessary! Just watching someone talk is BORING! Plus if it is just audio - downloading it becomes portable and now you are not tied to a screen. I can listen in my car, on my walk, washing dishes... Yes, maybe I need to listen and take notes, but sometimes a general overview of the content is nice too.