Yeah I would be ok with continuing with Nightwing. Maybe continue it with Dick taking the Batman mantle and introducing Damien as the lost son and gave him pick up the robin mantle. Idk though I'll always hope for a Batman Beyond game from Rocksteady since they have proven that they can make great adaptations of the Batman universe. They wouldn't even have to make it so futuristic as the comics/tv show portray. I love the introduction of the batmobile in Arkham Knight. Would be hard to make a game where a flying batmobile can go wherever you can. It's kind of like "why grapple or rocketboot when I could just call the batmobile and fly up there'