Well many in the industry assume that Batman would hit hard the young male audience and have crossover appeal in other groups. X-Files was intended to hit a much older base of viewers (those old enough to be one of the nearly 20 million who watched during its television run). Step Brother actually has a closer demo to what Dark Knight was geared to, even if they are completely different types of films. And it opened just fine. So the market place clearly could handle it. If people wanted to see it. And for whatever reasons, people didn't seem to desire to watch it.