But not in the context of a Batman film, or a superhero film. It almost be the equivalent of Bond dying. We've known the batman to be everlasting, so if he dies in the name of his mission, it only makes sense in regards to the themes presented in the past two films. As a man, he can die, he is flesh and blood and bone, it can be broken and destroyed. But as a symbol, he is everlasting and inspiring, Batman has spent his career using that to put the fear of god into criminals, maybe that isn't the answer, maybe just like how Thomas and Marthas death galvanised the rich into action into helping gotham, maybe Bruce Wayne's death will set into motion events that make sure Gotham will never go back to the depths that it was, proving that a city doesn't need to be destroyed to be saved, all it needs is inspiration and an example of heroics with a selfless act of sacrifice by bruce wayne.
You got that right, bruce will never really live a normal life, he will always have this monster in him, if he lets go it's because he is dead and finally at peace, if he doesn't die, then he will adapt. He can't just be the demonic bat-son of Ra's, nor can he be the spoilt rich kid bruce wayne, he needs to come to terms with both sides and be a combination. I don't believe he will "die" but he certainly won't continue as batman and he won't be on a house on the hill smiling.