Fox should send RBC Capital Markets analyst David Banks a gift basket. His report today that News Corp is sitting on a pot of $750 million that can only be tapped if The Simpsons is canceled gives strong ammunition to 20th Century Fox TV in its salary dispute with the voice cast of the long-running animated series. The studio has been holding a hard line, insisting on a 45% salary reduction for the actors, while they have been asking for a 30% cut in exchange for a piece of the backend. But whatever leverage the cast might have had is pretty much gone given how valuable the series would be if it’s canceled. And there is speculation that the actors could agree to new deals by sometime next week.