Imagine. Imagine big Triple-A games based on franchises like The Lord of the Rings, Game of Thrones, Harry Potter, etc.. Also, strategy games like Age of empire but with Game of Thrones franchise or Lords of the rings.
Imagine horror games based on the terror franchises they have. Imagine a fighting game in the style of Mortal Kombat featuring only horror characters.
They own Looney Tunes and Cartoon Network, for God's sake. They own the childhood of many people. Imagine them making party games like Nintendo with all the cartoon characters they have. Or fighting games, or racing games, or crossover games.
Now superhero games are a big success. They own all of DC. Imagine big budget single-player games based on Teen Titans, Constantine, Superman. A hack and slash with the female heroines (Batgirl, Black Canary, Harley Quinn, etc).
Hell, even a big budget Ben 10 game would be awesome.
I think Warner is sitting on a goldmine, but their executives are so useless that they don't know how to take advantage of all their franchises in gaming.