When Batman alone isn't strong enough to save the world...could a team of heroes-in-training help?

Batman: Detective Comics Omnibus collects together the stories of your favorite heroes from the Batman Universe! With Batman, Batwoman, and Nightwing fighting to defend it, is Gotham safe from any potential threat? ...Or is there a monster still lurking that would be able to take them down?

Batman decides to recruit young vigilantes and train them to be a team worthy to face any evil that may come to Gotham--will this vision for a team of Bat-Heroes be able to take flight or will it go down in flames? And what would Batman consider threatening enough to require a team?