1. Future Potential Plots
Using Robin as the lead as an inexperienced crime fighter raises the stakes of a Batman movie without going to as epic a scale as The Dark Knight Rises did. Indeed, a smaller movie where Batman and Robin have to take down a vicious street gang would suffice due to the danger presented by Robin being new to the crime fighting world and the emotional strain this would put on Batman to try to protect but not smother his young ward whilst also protecting the city of Gotham. This means that when the inevitable sequel escalation occurs the only way is up and future filmmakers arent straining the scale of the film to simply make it bigger than what came before. This would also help to differentiate the new continuity from Nolans era. Furthermore, if the studio did take this approach then they could attempt a very brave plot that would give this new incarnation of Batman the push it needs to escape from Nolans shadow. Imagine if Robin was established as the lead character in the first couple of movies in this new continuity only to be beaten to death by The Joker at the end of the first sequel. It would definitely be shocking enough to justify the reboot and also to justify introducing the character of the Joker again so soon after Heath Ledgers definitive portrayal. Imagine further if the studio were able to complete this plot arc before the proposed Justice League movie. Having Batman suffer such a personal tragedy before the big team up would provide some great drama at the start of such a film, potentially as the result of him vowing to never work with others again to prevent a similar disaster from occurring. Let me know in the comments if you agree or disagree and also if you think that this version of Batman is the best one for the reboot. I look forward to the debate!