Certain box office patterns prevail for different types of films released at different times of the year. December releases tend to have smaller openings and longer legs than summer releases. Standalones or the first film in a series tend to have longer legs than sequels. There are always exceptions - and hopefully STiD turns out to be one of them - but the odds are against it.Titanic made 28 million its opening weekend, eventually gathering more than 600 million in the US alone... The first Narnia 'only' made 65 million, and went on to make almost 300 (!) in the US... Maybe STID will be grower like those films... Word-of-mouth seems decent, like the reviews... It could happen.