The aversion Rocksteady has had with bringing multiplayer to the Batman: Arkham series will remain one of the most profoundly divisive decisions the franchise heads have ever made. Fans have begged to at least have co-op. Even at the end of the line, after Batman: Arkham Origins' Invisible Predator Online clearly proved that playing as the Dynamic Duo can be done right in an online experience. And yet here we all are, looking at another solo experience.
Don't get me wrong - the Arkham games are some of the finest single-player experiences from last-gen, and Arkham Knight will easily be one of the best next-gen games to come. Rocksteady has this formula down to a T. That's why it makes no sense to not try and do some sort of multiplayer. Whether it's a rebalanced and expanded version of the Batman: Arkham Origins multiplayer (which for some of us, was the only redeeming factor of Arkham Origins), or a cooperative experience, we want to see it.
Imagine solving a Riddler house full of puzzles, combat, and exploration. Almost like a hybrid brawler/dungeon crawler, it would require two players (they could choose between the current cast of challenge mode characters and DLC additions) to navigate the mechanical hell-hole and make it to the other side intact. There could be alternate solutions based on what character you play as, and levels themselves could be randomized, like in Dragon Age: Inquisition.
Both Invisible Predator Online and a co-op mode could even tie into the game's Challenge Mode, which has been a staple of the series and kept many fans digging into the game's nuanced combat mechanics. It makes perfect sense, but it needs the developers to take it seriously.