I predict this will be a movie, or a television special within 2 years.
Sorry - You're already behind the curve.
From Wiki:
"The TV series Supernatural parodied Slenderman as "Thinman" in the 2014 episode of the same name.[42] In 2016, American horror punk band Haunted Garage released an EP entitled Slenderman and Other Strange Tales, featuring a song and accompanying music video based on both the character and the 2014 stabbing case.[43] In January 2016, sources within the production company for the successful anthology series American Horror Story claimed that the sixth season story arc would centre on the Slender Man.[44] The sixteenth season of the crime drama TV series Law and Order: Special Victims Unit featured a story inspired by the Slender Man stabbings."