I'm not sure what happened to the novels, but as far as the adaptation comics outside of prequel material, I'm not sure it's that big a loss.
I think the last time DC did any comic adaptations of its movies directly were "Batman Begins" and "Superman Returns", and they were both pretty weak - basically just static drawings of scenes or stills from the movie set to essentially the final edits of the movies. I think the last comic adaptations of DC's that were any good were "Batman" ('89) drawn by Ordway and "Batman Returns" drawn by JLGL, because they were actually drawn LIKE COMICS rather than "Oh, never mind the action or drama, we need to worry about getting the actors' likenesses JUST RIGHT!" Indeed, this is why I tend to like a lot of Marvel's "Super Special"-type movie adaptations from the mid- to late '70s - the first "Star Wars" drawn by multiple artists complete with Biggs on Tattooine and a marsupial Jabba the Hutt in a Sgt. Pepper uniform; "Logan's Run" drawn by George Perez with the ice sculpture scene included; "Jaws 2" based on the earlier uncompleted version of the film with a financially-ruined Amity Island and a noticeable lack of stinginess with the gore and blood; etc., etc.
I think adaptation comics are kind of a dying thing in general, though, outside of the aforementioned prequel tie-ins. IDW had to stop printing direct adaptations of the Transformers movies presumably after some online retailer accidentally spoiled "Dark Of The Moon", and the only tie-in comics for Bay's last two movies were retailer-exclusive one-offs for Schick Hydro and Toys R Us; they finally got to do a prequel miniseries for "Bumblebee" set in the '60s, but that was BEFORE they had to do reshoots on the movie which just muddied its place in continuity even more. Even Marvel waited until the next movie in the MCU to do a direct adaptation of the previous one amidst all THEIR tie-in stories, but since the last one apparently was "Ant-Man" I think even they're just doing strictly prequels and tie-ins now.