Traycor
Explorer
D&D and its related brands could inspire the next Star Wars or Lord of the Rings from a sales point of view.
LotR's and the upcoming Hobbit are very similar to D&D. Really, even Star Wars is similar to D&D. Jedi have "magic" powers and spin around with glowing swords fighting the evil emperor and his "dark knight."
Harry Potter is basically a story where children are thrust into the world of magic. As is Narnia.
With the right minds (and funds) behind it, a WotC movie could be just as powerful as any of these stories that have become cultural phenomenons.