I think part of this is how society consumes information. In the 80s, you mostly had books. Sure, there were some video courses, but a majority of the learning was through books.

Now, people consume most of their information in video formats. Think about the rise of Vine, Youtube, TikTok, and the 100s of others out there just like them.

They are growing like weeds, because that's apparently how the public now likes to consume media, info, etc.