Scooby Doo isn't as popular as it used to be. They keep pushing out direct-to-video films that show up on Cartoon Network, but most kids are fans of those incredibly lame shows with no plot to them. I grew up with Scooby Doo absolutely consuming my childhood, so I wouldn't totally mind an attraction based on him. Warner Bros. Movie World has a mouse coaster themed to the live action Scooby Doo movie that seems pretty cool.