I disagree. If WB does hope to one day make a JL film why are we so against DC heroes cameoing in other DC heroes' films??? We all LOVED it when Tony Stark showed up at the end of Incredible Hulk and I bet people would love it if Thor showed up in Iron Man 2.... but it seems like just about every poster was against Clark Kent/Superman showing up in a GL film... why? I'm not.
Superman could show up in GL, then maybe GL could show up in the Flash film, and in Wonder Woman (whenever that happens!) could have cameos...
we gotta build up to a JL film somehow...