I actually like Robin. In fact, I am a huge fan of Nightwing, the grown up Robin, as well as the Tim Drake version. But, in the movies,
STOP LOOKING AT ADAM WEST AS THE "REAL" BATMAN!!!!!
FUCK'S SAKE!!
Sorry about that, but I am driven insane by moron's who suggest that Batman should have a "camp" feel, just because of a television show that was designed to make Batman look bad.
Anyways, Robin is great in the comics. But in the Nolan Batman movies he would be out of place, and completely ruin what has been an excellent series of movies so far.
When I saw Batman Begins and The Dark Knight, I was thrilled. They weren't perfect, but they were the closest thing we had ever seen. They weren't the horrible goth/camp movies of the 90's and they weren't the intentionally stupid Adam West version. They were dark and full of character, as Batman should be.
Here's the thing, this whole "dark" version of Batman, isn't new. I know, I know, wierd huh? But, Batman was supposed to be dark from the very begining. This isn't my opinion, it's a fact, look it up. But, basically, for it's time, the original Batman comics were "dark", and this return to that feel is about going back to Batman's roots, not creating something new.
Robin is a lighter side to Batman, and theoretically he could be done without completely screwing up this wonderful set of movies. But, and we're talking J-Lo sized butt here, it would be so incredibly difficult to force a Robin into these movies, that we have to ask, is it worth it? Is it worth risking a great movie series, just so we can see Robin?
As much as I love Robin in the comics, putting him in the movies has several down-sides, let's go over them.
1. Robin as a kid: This has some potential, but only if you keep the movies dark. If you do that, parents will lose their minds over a violent, dark, movie in which a kid kicks ass. See, everytime a kid is violent in a movie, they have to make the movie "camp" or at the very least, "corny", to keep the parents placated. Furthermore, you would have to add a child actor, and most child actor's can't pull off the depth required to play a dark Robin. 95% chance of ruining Nolan Batman movie.
2. Robin as a teen or young adult: This has the greatest potential. But, the question is, why put him in the movie? In the Nolan movies, Batman is young, and part of the appeal is watching Batman learn and grow under the guide of Alfred. If you suddenly turn Batman into the adult, and give us Robin as the young person needing a guiding hand, then what happens to Alfred? Micheal Caine is the best Alfred we have ever seen, and it's not just because he's a great actor, it's because Alfred actually has something to do in the movie. Think, in all of the other incarnations of Alfred in film, what was he doing? Nothing. In Nolan's movie Alfred plays a greater role than ever before, as he actually has a purpose. The alternative is putting Micheal Caine on the sidelines, and anyone who knows anything about movies, knows that benching Micheal Caine is always a bad idea. 90% chance of ruining Nolan Batman movie.
Also, it should be noted that having the protaginist need supervision from an older, wiser, character is classic good storyline material. Luke Skywalker wouldn't have been nearly as appealing if he had to train someone, and Obi-Wan/Yoda were left cheering from the sidelines.
3. Robin as Nightwing: It's not Robin then is it? Nightwing works in the comics because of the history, training, and relationship with Batman. In order to force this character, you have to either ignore that backstory, or speed through it. Either way, it sucks. Again, why put this character in the movie? If you put Nightwing in as a fully developed character, then you essentially have two "Batmen" running around, without any good reason. If you don't have him fully developed, then you have to speed through the reason why he is in the movie ( and God knows what that could be) which makes the movie rushed, and damages the character development for all the rest of the cast. Think, what is one of the great comlaints about Iron Man 2? It's that the development of War Machine is rushed, and underdone. 97% chance of ruining Nolan Batman movie.
Ultimately, the addition of Robin would need to be gradual and dark, something which isn't possible in potentially the only remaining Nolan Batman film.
As much as it pains me to say it, I would rather have them sacrifice Robin, then risk ruining Batman.