It depends how long the series runs for. I'm not sure if we truly know when Bruce begins his training, but I always thought he started in his late teens/early 20's. Perhaps the show could skip a few years. Who knows. It would be interesting if at the end of the series Bruce decides to leave Gotham to pursue his training. I'm aware. I was more so speaking for Montoya, Bullock and Allen. I always thought James Gandolfini would have been a great Bullock, but he's no longer with us now. John Goodman could be interesting. He's been known to do TV work in the past.