It's easy to read what I'm saying that way but that's not really it. It's more about who the authors are and who the awards committees bend over backwards to exclude.
There's been tons of Hugo Award controversies related to authors, excluded authors and content the last....15 years or so. (Although, to be fair, controversy and Hugos go back as long as the awards have been around).
In scifi literature the formulaic over-told stories aren't even being published anymore. It's more like stuff that's barely even science fiction...
Again, the sales numbers show that the classics in the genre are still selling. It's the new content that isn't moving.
Usually creatives will do something that resonates with them personally and sometimes this touches people universally. This isn't something you can create artificially IMO.
What isn't a given like you tried to say. A saturated segment just means it won't grow. They could have kept all of it forever if they handled it well.
At this point, in the Star Wars and Marvel universes, it all feels pretty formulaic. The stories have already been told, but now they have to keep producing something in order to make this quarter's earnings numbers. None of it feels essential to watch.