Hypothesis - Reduced verbal ability in the general population cause lower movie dialogue quality

An interesting hypothesis in this tweet.  Background - There are many complaints and criticisms that Hollywood has become far more dependent on franchise movies, remakes, and duplicative movies.  That Hollywood movies are less novel, less engaging, more generic and less interesting than a few decades ago.

Perhaps.  Certainly I rarely watch new movies.  The cost benefit ratio of my time during my prime earning years is far different than when I was a low hourly value college student.  But when I do try a new movie, I do have the impression of simpler plots, dumbed down vocabulary, more generic dialogue without cultural context, more CGI, more investment in effects rather than performances.  

So cost benefit might to blame, I might be a more observant consumer than I was, or I may be evolving into a crusty old coot.

Accepting the predicate argument regarding more generic and lower quality movies, I have focused primarily on the hypothesis that the major movie companies are far more corporatized than they used to be and far more dependent on global sales than American sales than they used to be.  Under this hypothesis, the movies are now more generic because the dialogue needs to be simpler for either dubbing or subtitling, cultural artifacts need to be reduced or eliminated because they also are hard to convert to a foreign audience, plots need to be modified to mollify foreign powers (no movies in China about Chinese imperialism for example), wit and humor need to be reduced owing to their cultural specificity, etc.  

Now to the main point.  Rob Henderson has an interesting tweet on some research.  The responses in the thread are as interesting.

"The average college graduate now has considerably lower verbal ability than the average college graduate 40 years ago. For employers, this means that a college degree does not have the same meaning as it once did for verbal ability"https://t.co/IQMXORZduX pic.twitter.com/Nc2t0g91Ru

— Rob Henderson (@robkhenderson) July 26, 2019

Commenter Christopher Herman links the decline in verbal facility with the decline in movie quality.

Herein lies the reason Hollywood movies are so tediously unoriginal. One should think remakes of the classics aspire to be better, but they don't have the level of verbal thought to improve on 40 year old screenwriting.

— Christopher Herman (@consptheory77) July 26, 2019

Possible?  Certainly.  Plausible?  Certainly.  Probable?  Maybe, but I would have to see more evidence.  Credibly Proven?  Not there yet.