That is like Bizarroverse news. What happened with the original Buffy was unprecedented. A failure of a movie is spun-off into a pop culture phenomenon of a TV show. If anything, it's usually the opposite (i.e. "Ferris Bueller's Day Off"). So if the only good thing to come out of the movie was the TV show, why would the people who made the movie think making another one completely unrelated to the show as much as the first one wasn't think doing so would be a recipe for success? The mind boggles.
It saddens me that nobody involved with the show became movie stars. James Marsters has only done TV guest spots and Dragonball. Angel (can't spell his last name) and Alyson Hannigan are TV regulars on modestly successful TV shows.
Even Whedon hasn't done much post-Buffy/Angel. I was really hoping when he was attached to "Wonder Woman" that it would be the first step in a great transition for him from excellent TV producing career to excellent movie director career (as "Star Trek" may be for J.J. Abrams).
Oddly enough, the cast member with the most potential for a good movie career right now seems to be Danny "Jonathan" Strong (as a writer!), who apparently wrote a hell of a screenplay for a TV movie called "Recount" and is lining up more solid screenwriting gigs. I really expected Hannigan to blossom into a beloved movie actress. I was disappointed that after her brief time in the spotlight in the "American Pie" series, all she did was (ugh) "Date Movie".
I can't believe Sarah Michelle Gellar hasn't been in anything really good since 1999. It looks like the only movies she was in that were half decent were "Scream 2" and "Cruel Intentions"...but they weren't exactly masterpieces and she only had a cameo in the former. It's like the cast and crew of the show have the same curse that seems to follow most Star Trek actors after their Star Trek career ends.