Perhaps now more than ever, with cinema ticket prices at astronomic highs, trailers are of increasing importance. For most people, a trailer will be the first impression one gets from a movie... A trailer shouldn't stand outside in its Y-fronts in broad daylight, swinging the script over its head and screaming the ending at the top of its lungs.
Adaptations are the mac 'n' cheese of modern Hollywood. The marketing executive dangles a shiny bestseller before the film consumer like a matador's capote; powerless to resist its allure, he dives for knowing it's probably a mirage of brilliance - and that he won't even get to gore the guy behind it.
At a conservative estimate, King has sold over 300 million books, and what the hell do I know, but isn't writing a book without a clear plotline a bit like setting off in a car with a full tank of petrol and seeing where you end up? It may work out, but more than likely you're going to end up at the equivalent of the Overlook Hotel. In winter. Without a toothbrush.
There are two comments that film critics/academics will often hear from non-film critics/academics when discussing a theory they have relating to a specific film. These are, "I think you're probably just reading too much into it" and "I don't think that's what they were actually thinking about when they made it".