IIRC, Mr. Burroughs was involved with early film interpretations, as the one with Herman Brix.
Oh, yeah, "Tarzan And The Green Goddess," filmed in South America. I had forgotten that one (but, then, it's so VERY forgettable). I believe he also co-produced that one, and said that Brix, who later changed his name to Bruce Bennett and ended up playing the private detective on the "Perry Mason" tv show.
I agree that there would be fewer bad feelings if this evil proposed movie were a story about another, as yet unknown Slayer rather than Buffy, and I wouldn't be surprised if that isn't what actually happens in the end, and this whole "rebooting Buffy" thing is just a ploy to stir up interest . And it surely has done that!
As for Ian Flemming having any input into the James Bond movies during his lifetime, he sold the movie rights to the entire series, including any future books, and was so disappointed in the resulting movies that he actually considered killing Bond at one point. ("You Only Live Twice." He renigged at the last moment and just gave him amnesia.) He was never consulted about plot or any kind of content of any of the movies, which becomes pretty clear if you compare the books with the movies bearing the same titles. And he was never satisfied with Connery. The only actor who he ever actually liked in the part was George Lazenby.
Both writers pretty much sold their characters and walked away counting their money.
And I STILL say that a story about a Slayer fighting demons in Civil War Atlanta would make a great story. Atlanta and New Orleans are both in the South, granted, but almost like two different worlds. LeStatte wouldn't be infringed upon in any way.