The point stands, the over supply is a huge factor. There’s so much content available that serves as a competitive/substitute for traditional film and tv that it changes the entire consumer behavior and economy around the industry, which translates to jobs.
I don’t think people will ever really want to only watch old stuff, or lack desire for new stuff. But, in terms of thinking about the volume of media available I think the non-expiring idea is valid. YouTube alone has 500 hours of video uploaded every 1 minute.