Story of Dick Grayson would easily be a least a Three Picture deal for whomever gets the starring role if you want to go the Harry Potter route. This movie would be entertaining for both kids and adults. Kids can relate to his heroism and it would have the dark gritty feel that would appeal to adults.
The first movie would not be a spin-off so I wouldn't expect Christian Bale to reprise his role as Bruce Wayne/Batman. This would not be a batman movie. Strictly devoted to telling Dick's Story Which means Bruce Waynes role in this movie though significant wouldn't be big. But I would love to see Bruce Wayne being potrayed by someone with a little bit of star power but not too much. Maybe someone like Adam Baldwin (The voice of Superman in Superman/Doomsday). The first movie would be about his parents being killed in the circus,being adopted by Bruce Wayne, trained and going back to avenge his famiies death. before Batman talks him out of it. knowing that killing wouldn't heal any wounds or stop the pain but preventing people from going through what he went through would make more of a difference. Thus Dick Grayson becomes Batman Sidekick Robin as the Caped Crusaders.
The second movie would be based on the Relationship between Bruce and Dick. A father/son type of a relationship. Where as though Bruce is having a hard time dealing with the fact that Dick is growing up and becoming his own man and making his own decisions that Bruce doesn't always agree with, Which is causing tension between to two Heroes. The older Dick gets, the more he starts to shy away from Bruce. Dick doesn't understand what Bruce is trying to do which is planning to pass the cape and cowl someday to dick. Dick doesn't want that. He wants to be his own man establish his own name. He wants his own Robin Signal He realizes the only way to do so is to break away from Batman himself and go solo.
That third movie starts off with Batman and Robin's last run together before Dick has that talk with Bruce before going solo and becoming Nightwing. By now Dick's in college and is in a new atmosphere. Which means new enemies a new supporting cast and more Importantly NO BATMAN! The Third movie would the beginning of a whole new trilogy. The Nightwing trilogies.
That being said these movie could a load of Cameo Appearances by Batman, Jason Todd, Barbara Gordon, Comissioner Gordon and etc. The story of Dick Grayson would be a great concept for a movie not only because it's a great story but it's action from start to finish. What do think CBM? I really don't have an Idea who could be playing the Role of Dick Grayson. Maybe you guys have Suggestions