The risk the director took was to make a film that works in the way that Stephen King;s stories work - which is why the film is so long. King takes his time to set his scene and draw his characters. His sense of detail and time are what appeal, and for once, the film makers saw this as the strength of the story, and created the film in the same way.
King's characters are always flawed, but essentially human, people getting the best out of their lives that they can, and King believevs in the fundamental goodness of the ordinary man. That is the message that shines through this film - a good man made a mistake, paid for it, and came out the other side. It's a message for everyone,. which is why it strikes a chord in so many people.
Because of the short attention span of the average movie audience, the time and care taken by King as a writer would get shortened so much, the essential pleasure is destroyed. This time they took their time, and did it right.
Consider that this is only a 'short' story in King's terms - maybe they'll make 'proper' version of 'The Stand' which should clock in at about twelve hours!