This is the beginning of his journey. It's supposed to mirror Bruce's journey when he was that age. Early 20's, mid-20's. He will train. He will need some help with creating a bat-suit, he will go out there at first without a cape/cowl (probably like Nightwing), he will eventually be Batman. Plus, Gotham needs time to process what happened and rebuild. It's fine now. It's a city that is inspired by Batman. But there will be a time when the city needs a Batman. He will be there to do it. History repeats itself. On and on through the generations.The film ends with him taking Batman's place, but he wasn't by the League of Shadows or even Batman and will mostly like wind up getting shenked on his first night out playing hero.