The entire history of art relies on rethinking of classical plots in new ideology.
People like to slag on Rian Johnson, but it was JJ Abrams that trashed the trilogy and left the mess to Johnson. And none of this has anything to do with video games anyway, Disney executives dropped the ball with bad hiring and that turned the Star Wars fanbase sour to future movies.
Why? Is it not possible the proportion of the population that wants to watch movies (especially non novel ones) in movie theaters is trending lower and lower?
Based on the fact that the examples you listed are all sequels, the quality of the content is also suffering, but it is very possible that even if it was not suffering, the demand would be lower.