As I've said before, too many people are forming opinions about this movie because of their loyalty to the TV show, which, as we all know, wasn't the original Buffy, despite the fact that Joss' baby got screwed royally in the movie version. Let's face it, Sarah, David, James, and the others will never get together and recreate their old roles, and even if they tried, by the time that it actually happened, they would all be too old for the parts.
This (supposedly) upcoming new movie is not going to try and recreate the original story with new actors. "Our" Buffy won't be affected in the least, no more than Weismuller's Tarzan was threatened by the next actor to play the role. No more than John Wayne's Rooster Cogburn was threatened by Jeff Bridges' version of the character. No more than Rathbone's Sherlock Holmes was threatened by Robert Downey jr's version. And O won't even go into Lugosi and Christopher Lee as Dracula.
I hope that the movie is great. The next Star Wars. That will bring more interest in the character in general, which will result in the Sunnydale crew coming back into the spotlight. On the other hand, if the new movie is a flop, we can THEN all stand back and smugly say, "I told you so. Now, if you want to see what Buffy's REALLY about..." and we end up, once more, with more people interested in the characters and the story.
Let's just wait and see how it pans out.
(And, by the way, I've gotten several people to watch Wayne's "True Grit" since the new movie came out, and they all agree, the Duke's belly is more convincing than Bridges' grubbiness.)