That much, I have to disagree with. Angel/Angelus as a character is far too tied to Buffy and the Scoobies. You can't consider them completely separate when you have so many ties between the two - particularly Spike, who is a firm link between both television series. Plus, Dark Horse is picking the Angel line of comics back up, so they're still canonical to the Buffy series. There are people who dislike Angel as a character for a bevy of reasons, but I think its a bit overly to consider him unnecessary to Buffy's continued story arc. When one character has as big of an influence on another's future actions, you can't count them out entirely. The comics kept up that theme, of the two being indelibly linked, through the whole Twilight debacle. Of course, this falls into my thought that the latest seasons of each series had characters stepping too far outside their canon grounding - I can't wrap my head around Buffy/Spike and Angel/Cordelia, and not because of a Buffy/Angel shipper thought, but because it seems too unlikely in the growth of either character, with their earlier grounding, to go to that place. You can't erase a character's history just because it's been a couple of years and you want to include a new romantic subplot without bringing in new characters. Seriously though, the de-fanging and re-souling of Spike pissed me off to no end. Useless. Either way, I still think Buffy herself is done. With the calling of all of the potentials, there is SO much wiggle room to write about a new Slayer, or Slayers - fallen on either side of the line between good and evil, for that matter.
I have been meaning to reply to this for days, here's hoping I don't get interrupted this time. First of all, I don't consider Angel and Buffy to be COMPLETELY separate. All I really meant was that he doesn't necessarily have to APPEAR in a "Buffy" film, or have a giant role if he does. The other characters don't have to act like they've never met him and whatever he does in the future that's so important could still happen. And if enough people want it, there could be an "Angel" film as well in which HE was the main star and Buffy has little or no role. I just think they make each other more mopey and boring when they're together.
Also, I value the knowledge of the Buffy comics you bring to the table, since I haven't read them. To some extent, though, I just wanna say "Bah! Details, details, details!". Not because the comic stories aren't important or have no place in Buffy's canon, but because we could use similar logic to say there should never be another Spider-Man, Batman, Avengers, Iron Man, Hulk, Thor, X-Men or Superman film. You admit that there is wiggle room for other characters in the same universe, why is there not wiggle room for Buffy and all the main Scoobies? Whatever Buffy and Angel are "destined" to do, in the kind of world Buffy inhabits, destinies can change, futures can be altered, by all kinds of different means. If Joss Whedon didn't want to use something that's in the comics, it doesn't mean he has to just junk it. He can find a creative way to turn it into something else. Or he can find a way to work around it. If he can fit all the subplots and backstory of the characters in The Avengers
into a cohesive film, he can manage to make a new Buffy movie without having to either disrespect the comics or be a slave to them.
Also, I agree with you about Angel and Cordelia. I don't really see them together. As for Spike and Buffy, I actually liked the complexity of their relationship. And I really liked it when Spike got his soul back. I thought it was more meaningful than when Angel's was restored to him against his will by a (kind of wussy) curse that was just meant to basically make him think about the bad things he'd done. Spike had to earn his soul back, and I think that made for a better story and a more compelling character. The episode "Beneath You" in season 7 is one of my favorites.
Thanks for the discussion, even though YOU ARE TRYING TO KILL BUFFY!! Heh. Just kidding about that last part.
BTW, I would be fine with another vampire slayer being called if she was a quality character played by a talented actress. I want the entire "Buffy" universe on the movie screen as much as I want Buffy herself back. I do think Gellar would at least need to have a small role in the beginning where she could be killed off, though.