One of the most frustrating questions for improvement professionals is "why don't proven improvements or ideas immediately catch on and scale up? ". Too often, we expect improvements with demonstrated results to "spread" across our organizations. This is rarely the case, and there are many reasons for this. Here is an article from Stanford Social Innovation Review describing the reasons for the "stagnation" chasm that examines reasons proven social innovations don't catch fire - I think many of these principles apply to operations as well.