Anne Rice gets you Twilight gets you non stop vampires.
Lord of the Rings being made into a series gets you non stop fantasy.
Publishers couldn't give a crap on content anymore. All they want is to push the next product or ride on the coattails of a proven product. There isn't any pride anymore.
There is some sci fi but it is mainly the few tried and true makes and remakes (Star Trek, Battlestar Galactica, etc.) Not much on the print front.
Have you tried the Warhammer 40K series?
I’d love to see all of the “The Chronicles of Thomas Covenant, The Unbeliever” books made into films.
This is why I do my SF reading shopping at used book stores. Books published back when those involved had brains. The prices are pleasing, too.