How much of this is a failure of the medium, though, rather than of individuals' jaded palates coupled with the availability of almost all hit movies from the past for instant home viewing? We tend to glamorize earlier generations of the movie industry because some of their products have stood the test of time so well, while overlooking the abundance of terrible films that came out around the same time.

I do think that plotting, which is only one element of a film, tends to get more predictable as viewers age. There are only so many basic dramatic situations, and nowadays genre tropes are so well-defined and well-known that almost anything is going to look familiar and derivative to somebody, and be blogged about in such terms. On the other hand, a good film can be enjoyed repeatedly, despite the element of surprise being gone after the first viewing; the pleasure is in the quality of the execution rather than in the novelty of the story development.