"Will likely"..
It's a pain in the ass to go back to every single existing thing and make sure it follows the new rules. Oh, they COULD, of course, but there's no gain in it, realistically, unless someone starts selling compilation DVDs...
What pain in the ass? Every episode of, say, STC violates the new guidelines. So you send them a C&D/takedown. Done.
(Not that I want CBS to do that -- far from it! Just pointing out it's really easy for them to do so.)