I'd love to see robin in nolans batman universe. Robin has greatly evolved beyond the "HOLY RUSTED METAL BATMAN". The kid can be just as serious and badass as his adult counterpart. The stigma of Adam west tv show and the goofy sidekicks of the era have have harder to clean then what it did to their bosses.
there's definitely a way to make Robin awesome on screen... particularly Dick Grayson. grayson is the "world's greatest acrobat" and using live motion as a medium as opposed to flat panel in comics the potential to make the action/fight scenes with robin sooooo cool exists in movies in a way you couldn't convey in comics.
the best physical embodiment of Robin is ironically an ASIAN actor named Tony Jaa. He's about the size of an adult Nightwing and he too is the world's greatest acrobat. Look how this guy moves, he's untouchable exactly the way Dick Grayson would be in a fight. Towards the end of this
clip from Ong Bak is a scene where tony literally runs down the alley ON the shoulders and heads of the bad guys before they can react. This is the type of energy and dynamism of Robin that's never been shown, and why audiences would connect with him. What's NEVER been captured on film is the idea that this man is the greatest human (non-enhanced) embodiment of spiderman... but since he's human you dont use CGI you use the sickest human stunts possible using walls, furniture, other ppl as props.
now do you cast some asian dude for a batman movie? no obviously no one wants that but that's the type of energy robin character could bring if properly utilized on screen. imagine a movie where robin is jumping over ppl and bouncing off walls as a distraction while batman moves in from the shadows and just CRUSHES dudes
that's talking about action--what insipid audiences looking at a summer movie would like. thematically Robin has always been problematic in the Batman universe. it's always been problematic and frankly inconsistent for batman who knows better than anyone the danger and emotional dehabilitation that crime-fighting entails. he would NEVER subject a kid to the same life. sure bruce wayne might take care of Dick and Tim and dozens of kids like em and find families and schools for them but he'd never bring them so close... the chance of collateral damage would be a price too high for a "protector" like him would ever pay. even the writers know this: batman would never want robin to exist... that's why there's always a duex ex mechanism for how robin actually breaks down that barrier... something stupid like how he "finds" the batcave or he steals hubcaps off the batmobile...
robin was created SOLELY to sell comic books to kids in the 40s after the success of Billy Batson. and he has ALWAYS existed to serve as the foil for batman, in everything from demeanor to bright costume, fighting style, personality etc. the poster above talks about how a "dark robin" is cool. hell no how is that cool? a dark robin is even lamer than a bright fruity robin (which is damn lame already). a "dark" robin basically is a "mini" batman... basically giving up on the Robin character and deciding the only way to make him workable is to retool him into a mini batman.
that is lame... either DO NOT HAVE the character (best choice) but if you're determined to have the character then retain the thematic elements of it, imploding the character and reinventing him is lamer than anything else. Even the very concept of Nightwing is basically giving up on Robin and writers making the best of it by creating a entirely new character.
Then what? instead of just batman, or batman & robin now you have 2 dark brooding batmen. why the hell do you need TWO batmen in a batman comic? you dont... that's why nightwing had to leave town or you get a new robin.
the same dynamic exists for any batman movie... you do not need robin as "heir" or backup batman. IF he exists he MUST exist as a foil to batman... he will NEVER grow up to be batman. where does something like that fit in Nolan's universe? no where