Its funny that you mention it. I was thinking Empire as I walked out of the theater. The good guys don't walk away feeling too well after either movie.
But with a 3rd being lighter and more uplifting, does that mean nipples on the Batsuit and Robin? Actually, given what Nolan and company have done, I think they could actually string together a decent story involving Robin, even though I never want to see it. I know there's one story out there that I actually liked that invovled Robin, so it can be done.