Affleck is a hack. He's co-produced/directed one good film (Argo was overrated, imo) and he's elevated to "good director?" Zack Snyder was considered a good director after 300 and Dawn of the Dead but look at the mess afterwards. DC throwing the next Batman film into Affleck's hands shows how desperate they've become.
Those who mentioned Selina as being a key figure in the future of Batman are probably not far off. The female superhero sub genre has all but been unexplored, neglected or badly represented by both big 2. Wonder Woman must be a success and the Justice League with it. If Margot Robbie is embraced as Harley, she may figure as well. What would follow are projects focused around a female centric DCEU including Barbara Gordon, Harley Quinzel and Helena. This is the corner that DC backed themselves into and the only possible way they can hope to compete with the monolith of the MCU .