No I think Christopher Nolan knows what he created. He made Batman into a realistic superhero, and these movies will be a legacy. I think he knows that what he made with Batman is special and he won't ruin it by making more. I thought the ending was perfect. I can see why you would think the ending was wide open, but I disagree. There is room to make another plot out of the ending, but based on *Spoilers* the look Bruce and Alfred shot eachother and what Alfred said earlier in the movie, Batman was gone for good and Bruce would not die sacrificing himself for Gotham. If they were to continue the series they could do it with Robin though.

I doubt it. It was rumoured that Nolan didn't want to do a third one after the death of Ledger.

I doubt he will want to continue.

"The Dark Knight Rises has now taken in $835.4 million, and with China and Italy still on the horizon there's a very good chance it eventually passes $1 billion."

~boxofficemojo