The book series is designed to give fun chills and thrills to upper-elementary school children. They're very popular in the schools I sub in. Being spooked is fun. But from the "trailers" - I still call them previews; call me old-fashioned - the movie seems WAY above the level of young children and more in the Conjuring thing designed for an adult audience.
Some surmise that the decline of DS was because of HoDS. Parents knew their kids were watching the show by the millions and it was about "spooky stuff" (as my mom called it), but beyond that they had no familiarity with it. When they accompanied their children to the theater and saw a color-laden, fullblown Hammeresque version of the original Barnabas/Maggie/reincarnated-Josette story with blood, guts, violence and gore, they would not let their kids watch the TV show anymore. The one's who surmised that said it contributed to the decline in viewership. Whether or not that's true, that needs to be determined by research. I know teasers/trailers/previews don't tell the whole story of a film. But if the scenes in them for SStTitD does show it to be more graphic than the books, it could spell a problem for their popularity.
Gerard