"The Dark Knight Trilogy" is a pretty arrogant term for the "Nolanverse" Batman movies. On that note, "Nolanverse" is a pretty clunky catch-all term for the most recent Batman pictures, but whatever. Notice they didn't call it the "Batman Begins" trilogy, and I'm sure the fact that Batman Begins didn't make a billion dollars at the box office has nothing to do with that. Nope.
It shows DC Comics and Warner Bros. have no clue what they're doing. They're blind, grasping tightly to whatever made them money the most recently, instead of trying to figure out HOW these films made money in the first place. The only reason we didn't get more Joel Schumacher garbage is because "Batman & Robin" tanked at the box office. Nobody got the sudden epiphany that he was the wrong director, or that they were putting too much pressure on him to make it into a toy commercial.
Those movies didn't stop getting made because they were awful. They stopped when they stopped making money. That's it.