But the article points out that the students here don't even watch movies themselves -- "students have struggled to name any film" they recently watched. Why are these people even studying film? The inattention is clearly caused by disinterest.
The phenomenon observed here must be caused by a combination of the general loss of discipline (which is the fallback attentive mechanism when interest is absent) and students' disinterest in the field they chose to study. The former has been well known; the latter is worth considering more.