This is a dumb idea. While I agree with not needing another orign movie for Batman, here are the problems that come from rolling out a Justice League movie ahead of individual films.
- WB is betting that Man of Steel will be a hit, and while I hope it is. That's not a given. What if it flops?
- WB flopped with Green Lantern, but they are content to let Reyonlds come back for a JL movie?
- In 2015 you are going to cram a JL film that will feature Wonder Woman, Flash, a new Batman (Bale aint coming back for this) and along with Superman, and GL and try to have 1) WW, Flash, New Batman try to establish themselves a bit, while having to reestablish GL to fit him more inline with whatever Cavil is going to bring to Superman. The reason why 'Avengers' worked is because with the exception of Mark Ruffalo's Hulk; Evans, RDJ, Sam Jackson, Scarllet Johanson, Liam Helmsworth had already established their characters in the previous films (hell even Jeremy Renner's Hawkeye cameo established what was coming in the Avengers). In Avengers it was all about blending their characters into the fabric of that world. Even at 3 hours you are going to have to have to spend sometime establishing 4 Characters (including whoever the villian will be) and I don't mean in the context of origin, but rather allowing these actors to get bring something new/interesting/fresh to their roles. Doing the model this way almost garauntee's that Wonder Woman is going to be done poorly, whoever is udner the Cowl for Batman is going to just do a bad Bale impression, and we will probably get a Flash that's going to be comic relief (like in the God AWFUL JL script that was floating around.
If WB wants to win the war, instead of a ticket battle, thety would scrap this and adapt the Marvel Model. Give Wonder Woman, and Flash a movie so the actors playing them could create something in the roles to build on. Give GL a reboot (perferably without Ryan Reynolds), and use Batman like the Hulk and save him for the movie, or better yet maybe make Batman the Nick Fury that cameos in enough of the other films so that by the time JL the actor playing him can set himself apart for Keaton/Bale.









With this decision what DC/WB needs is what Marvel at Disney and also Marvel at Fox have: a knowledgeable overseer to coordinate this film and the DC movieverse. I nominate writer/producer/director David S. Goyer. He knows comics and is already involved with the movies, having written the stories for the Nolan Batman's and Man of Steel.