I've come to believe that we're moving into a post-medium world for storytellers.
Chuck Wendig is primarily an author of books, but he also writes for film and for Transmedia.
Danny Stack is primarily a UK Scriptwriter, but he's also writing for comic books and he's making short films.
John August is primarily a Hollywood screenwriter, but he's also writing short stories, developing software, and even writing musicals.
The medium seems to matter less and less, but the story is still king.