Part of the issue is D&D's identity is intentionally vague becasue the players are deciding on the characters, plot, and setting. Sure, there is some published adventures and novels, but they dont penetrate outside the fanbase (and even leave a lot of the fanbase behind.) I know settings are all the rage, but with every new published setting, D&D gets harder and harder to identify. From a game perspective, thats a good variety thing (though I question even that looking at PF) from a film/series perspective its really bad.