I think WB could have pulled an Assassin's Creed, using the Arkham games as the template for the next Dc games and release a new game every year or two. Like 2015 for a Batman game, 2016 for Superman, 2018 for Wonder Woman and 2019 for an Aquaman game. Then repeat then cycle and also make a Flash game sometime later and a Justice League game that features several characters as playable. It seemed like they got their formula with those Arkham games and it is just weird that the Dc games that came out after Arkham Knight were those Lego games, Arkham Vr, a Batman tell tale game and Injustice 2. Nothing really similar to the Arkham games. The more I think about time, 2015 already does feel like such a long time ago and I doubt there's gonna be a Dc game like Arkham next year.
Also Man of Steel, Wonder Woman 2017 and Aquaman 2018 were quite successful that it should have motivated their gaming company to make a solo game for those characters.