It would certainly have been nice to see him (especially since he didn't make a proper DCAU appearance outside of B:TAS/TNBA) but if he had shown up too, the movie may have felt cluttered. The inclusions of Barbara and Harley suited the movie and fulfilled specific purposes, but Dick didn't need to appear. I think his absence is a gentle reminder that the Bat-family was never the strong unit it could have been, since too many bridges were burnt between Batman and his three partners. Though Dick knew Bruce the best of the three of them, he also knew that Bruce could never change and be the father figure he originally promised to be. While Barbara and Tim are able to pull together with Bruce at the end, Dick is nowhere to be found because not all of the mistakes of the past can be erased. That's how I view it, anyway.
But the JLU cameo was not enough; I wanted to see him again too.
Edited on 10/24/2008 1:58pm