I, personally, would really love to see the multiverse incorporated into the Elm Street series. I always considered the Freddy from the original movie to be a separate entity from the Freddy in the sequels anyway. Maybe use the Necronomicon Ex-Mortis as the McGuffin. I could totally see Freddy chasing our protagonist(s) use the book to jump through alternate timelines, encountering different iterations of Freddy and saying howdy (and farewell) to some beloved Elm Street veterans. We could also see movies that never were.