If it's crap ... We'll tell you
The Christopher Nolan series of Batman movies, is about Batman, the early years. The question I have is does Batman, truly becomes the master when he takes on Robin/Dick Greyson as his ward. What I am not looking for is a repeat of the Batman and Robin movie.
If the first movie is about the journey of Bruce Wayne, from person to Batman. The second movie in this opera, is Bruce Wayne now fully as the Batman. Batman becoming the parent/teacher would be the natural progression for the character development.
The model for how this story should be handled is the Robin Origin story from the Animated Series. Again, robin could only appear at the end of the movie. But his inclusion in the series would end this begining phase of the Batman story, beginning the next chapters in his development.