How has Batman been proven to be useless in the League? In the first arc of Nu52 JL, he realized that they needed Superman to stand up to Darkseid and rescued Superman from capture. That didn't make anyone look bad, was cool moment for Batman, and was pretty key in getting Superman into the fight. In Forever Evil, Batman helped the rebel villains break into the base where Nightwing was being held. He was also the only hero not captured by The Crime Syndicate. Once again, no one looked bad and Batman contributed. I didn't read Throne of Atlantis or The Amazo Virus, but in two fairly recent JL stories Batman contributed to the team and it wasn't at the expense of anyone else on the team. So having Batman leave the League to go start up Inc. again isn't the only logical way to go.