Can they film the void? As the North American movie business crumbles — the industry’s expected to sell fewer tickets this year than it has in almost a century — executives are analyzing the data. The takeaway? Most people only go to the movies a few times a year, and films are having to pump more dollars into advertising to see any return at all. And the more 18-to-24-year-olds divert their eyes to Netflix and Snapchat, the more studios are banking on sequels, which may stifle cinematic ingenuity.