A new sequel to Poltergeist that completely ignores Poltergeist II & III. Ideally, such a sequel would revolve around a grown up Carol Anne dealing with a new supernatural threat completely unrelated to the one from the original movie.
A film adaptation of the '90s kids' horror anthology series Are You Afraid of the Dark?. It'd be made in the same vein as Twilight Zone: The Movie, taking stories from the original series and remaking them for a new audience. Ideally, this take would be somewhat more mature than the show was, reducing the campiness, tightening the writing, making it somewhat more gruesome, etc.