Isn't that an improvement overall? You decide you want to watch something and you watch until it's finished. Media consumption habits in the TV era were much more passive and a lot of people would watch a show just because it was on. "There's nothing good on TV" used to be a common lamentation, I wouldn't be surprised if this generation is better at switching off entirely if there isn't content they want.
> A third of teens haven't read a book in the last year
I doubt it makes up the short fall, but does anyone know how well the audio book industry is doing since sites like Audible cropped up? I haven't read a book in some time now but I've listened to several because they have several advantages over reading and the only disadvantage I can think of would by for someone trying to improve their reading ability.