Me: Guess what. Batman retires for 8 years but comes back because of Bane.
Friend: What? That's absurd! You don't retire from being Batman. This is not some 9-5 job that you just quit one day because the boss is an *******. It's a pledge, it's a promise, it's a lifestyle dedicated to uproot and destroy the criminal elements of Gotham. If Nolan is so dedicated to realism then he must realize that crime isn't just going to lie down because poor wickle Batman is not feeling well and just can't Batman anymore. Ra'z Al Ghul, Scarecrow, Zazaz, Maroni Family, Gambol Family and the prince himself, Joker all in the span of two to three years. So what happens during those 8 years? Just petty thefts and jaywalking? Forget major villains, surely serial killers and rapists still exist. Bruce Wayne became Batman because he wants to avenge the deaths of his parents and doesn't want anyone going through the trauma he did. So what, he just forgets all that because the cops are after him for (NOT) killing Dent? He doesn't even want to be Bruce anymore, he would rather be Batman 100% of the time because he's obsessed with this monster of his like Alfred said. Batman may die but he doesn't retire. 
Me: So I assume you are not going to see the movie?
Friend: F no! I trust Nolan. He's got plans...