Well Argo had about 150 speaking parts and Ben managed to direct all that brilliantly while also acting in it, so I think he has the full ability to pull that off. In an interview, he actually admitted that he does most of his work as a director before he starts shooting, he's really into the research and preparation process and provides the actors with as much material as possible so that he won't have to give too much direction while filming and treat them more as fellow actors, to also make them feel more relaxed. He does a lot of takes, almost Fincher-level, especially of himself if he is in the lead, so he really makes most of the decisions in the editing room. So I don't think that the fact that it is a superhero movie would make it more energy consuming for him than the movies he's already directed but it would certainly take more time and in that same time he could probably direct 2 movies of the magnitude of The Town or act in other movies. He also has admitted that one of his shortcomings (or strengths, depends how you see it) as a director is that he favors script and acting over style and aesthetic, that's why his movies often give a 70s vibe, and that goes a bit against the general rule of making superhero movies I think, but maybe that's just me. On the flip side, as it has been said, he's really great at maintaining tension throughout the movie, which would be perfect for a Batman solo. However, his recent quotes make him sound like he would really like to direct a Batman movie in the future though, but feels a bit insecure or in a dilemma, or maybe just doesn't want to openly express his desire out of respect for Snyder. Who knows? Either way, I would be all for it. I really love Ben as a director. Well, I love Ben period, but especially him as a director.
