That is 100% true. And there's nothing wrong with it legally, ethically or morally. I think the issue, however, is that Marvel put some thought into how to set up an Avengers movie and benefited from decisions made along the way. WB seems to have simply looked at the grosses for Avengers and decided to just imitate the film concept without considering the need to lay the groundwork that actually made the concept work. Sure, it might turn out okay. However, given that we have only an untested Superman reboot, a failed Green Lantern film and a successful film Batman that won't be part of the team (in that you don't have Bale/Nolan) to lead up to it, one has to wonder just how they think they'll do this film successfully at this time. I respectfully disagree. I don't think people are ready to move on. They just want to see films that are good. People went to Avengers initially because they liked the bulk of the films that led up to it. They saw a series of good films and saw this as the latest in that series. Word of mouth built up because the film was actually very good. No, the sequels probably won't do as well, simply because I don't think they'll have the same word of mouth. But they'll still do well. DC's problem is that they're trying to build on films that either didn't work, haven't come out yet or aren't likely part of the same continuity.