Agreed with you last time, agreeing with you this time.
To rephrase my opinions on the matter from last time, I think a lot of the problem people have is that they believe Batman can't be gritty if he's got Robin, whereas I think this is provably untrue. The naysayers point to Batman & Robin, Batman Forever etc, but in my experience that's because they haven't read some of the comic books, like Dark Victory. Anyone who can read Dark Victory and say that it's an upbeat novel is clearly the sort of person who begins each day with genital mutilation.
Also, Death in the Family, one of the most highly regarded of all the Batman stories, is focused entirely around the development of Jason Todd, leading to his eventual (You should know this by now) death. Dick Grayson was introduced with his parents brutal murder by a mob boss, Tim Drake's father gets murdered, his mother gets mrudered, his girlfriend gets murdered, and then Batman seemingly dies and there's a massive scuffle over who gets the cowl, these are not light and fluffy plotlines.
I don't just think there's room for Robin, I agree that there's a need for Robin. Batman alone is a borderline psychopath, Robin brings him back from that brink (another thing which is explicitly commented on in not just one but several comic books.) Also, remember Ra's Al Ghul's little demotivational speech about Bruce's father failing to act? Robin in any incarnation gives Batman the chance to be the father who did act to stop the violence, so it even makes sense in-universe. There's nothing inherently comical about Robin just because he wears a circus highwire costume and makes the occasional joke (again, really not something he does in Dark Victory). It's all in the treatment, and if Christopher Nolan honestly couldn't handle Robin right then it's his failing as a director, not the character's failing (and also the writer's fault for not writing him right, casting department etc.) And for the record, so I don't get misquoted, I think C Nolan could handle Robin, it's just that he doesn't want to because he's hit upon the dark and gritty market, so he's not really pushing any limits with the films.
Overall, I know Robin won't be in the third movie of this remake (both Nolan and Bale have stated they'd walk out if it happened), but I think he should be, and I think if he was handled well, he could prove to be just as much as a surprising character as this new interpretation of the Joker was. Because remember how everyone said Heath Ledger was going to be awful? Remember how that turned out? There is nothing at all to say that adding Robin couldn't be just as good.
TL;DR: Batman needs Robin to stay sane, and Tim Drake was the most awesome Robin ever.