Here's an alternate interpretation: they're watching television now rather than movies. Because the kind of character development and depth of storytelling that can happen in 20 or 50 or 80 hours goes far beyond what you can do in 2 or 3.

And the idea that young people can't watch long things due to a lack of attention goes directly against the evidence of the increasing habit of binge watching.

Forget about watching a mere movie for just 2 hours at a time. Try 4 or 5 hours instead, where you can cover almost half a season of a drama. You immerse yourself in the world for an entire evening, the way people used to do with novels.