TDKR ended on a different note. It's film, not comics, so they have the ability to make an ending happen for the character. The comics don't have that luxury.
You either like it or you don't. But it's Nolan saying "What if Bruce Wayne's story had an ending?". Plus even though he wasn't close to 60, there was a point in the story when his body was like a 60 year old. I truly feel like a lot of that was put back into shape but the story was very different but important, in telling a story that says "the torch can be passed onto generations of people. A symbol that can last forever even when Bruce is dead and gone or incapable of doing it himself." It's also a story about Bruce letting go of his pain and anger.
This version of Bruce, since Begins was not the Batman who made a vow to his parents to make sure he does this for life, as a mission, so nobody has to go through what he went through as a child. Since Begins it was about staying in Gotham only for "as long as it takes", to show people that the city doesn't belong to the criminals and the corrupt politicians. It was ALWAYS supposed to be temporary and he was always looking to retire and pass the torch...those plans kept getting delayed until he got himself in such a rut, he had to re-evaluate what the original intention was all about.
The trilogy ended full circle, and it was a perfect ending for THAT version. If Shikamaru or others think it goes against the essence of Batman, guess what? This was a different interpretation. It's not the comics, they could actually END it if they wanted. And if Bale returns to JL what are you complaining about??? It would match your thoughts on Batman. Never quitting.
If he came back, it also wouldn't spit on the trilogy because he could start taking care of different cities in need, in other parts of the world. Creating the Justice League and Batman Inc.
Passing the torch was always the plan in this version. Stop comparing it to the comics constantly.
The haters just want Batman to live forever through Bruce Wayne. For him to be Batman for 30 years straight, but this was a more grounded approach. Nolan took the liberty to have Batman live on forever through multiple people.
And why would a fan of Bruce Wayne not want to pull for him and see him live a happy life? Don't you think the character deserves peace? Even if you want him to return a few years later for JL and get back to the brooding Batman, don't you want to see him at least be happy even if it's for a few years only with Selina?? I find that baffling as a fan. It almost feels like some of you guys are trying too hard to be fanboyish and geeky about it like "I DONT CARE! ITS SO COOL THAT HES ALWAYS DARK! HE SHOULD NEVER HAVE A HAPPY ENDING CUZ MY BELOVED COMIC BOOK SAYS HE CANT!" It's so juvenile to me. Why would a happy ending for this character, permanent or temporary be a horrible thing? It should be an emotional thing to see.
Especially Nolan's version who like I said, never made a vow to his parents. I question if people were even invested in this character during Begins, TDK into TDKR or were you always thinking of where it should go so it matches the source material?
To answer your post Great Mind(s). I don't see why Blake can't get training. He has time. That's not the point. It must start with having the will to do it, and Blake has it. The training is secondary. It'll come. He may not be Batman, but using the symbol in his own way, so his level of training is irrelevant.