gooberking: I know TV resurrection is turning into a popular thing, but there is a bigger problem with this series in that it has been a story being continued elsewhere, and that some of the characters aren't supposed to be aging. James and David visibly aged over the course of the show. David seemed to stop aging, but it has been a lot of years.
Barry_Woodward: James Marsters and David Boreanaz wouldn't be front and center in a spin-off. Even if they did appear, there are ways to handle it. With Spike, perhaps he Shanshued. Basically there was a prophecy that a vampire with a soul would become human again. Angel famously signed away his destiny to Wolfram & Hart in the series finale, but perhaps Spike ends up fulfilling the prophecy which would allow him to age naturally. With David, like you said, he has seemed to stop aging. He actually look healthier than he did in the final season of Angel.
gooberking: I would also be really worried about how you reconcile the inevitable issue with not being able to get cast members back. Somebody isn't going to be able to do it, and I know from what I've seen on Twitter Nicholas Brendon has had some serious depression issues going on. It may be a lot to ask as far as "getting the magic back" goes.
Barry_Woodward: Once again, if we're talking about a spin-off he needn't be involved beyond cameos, his metal health permitting. It's also worth pointing out that Nicholas Brendon has a twin brother,
Kelly Donovan, that could sub in for Xander in a pinch.
Dude, that's twin sin! I had a twin as an S.O. for years and the general rule is don't treat them like they are interchangeable. That is a generalization that may have nothing to do with them, but that's how my ex felt about it. BTW I do know Kelly did do an episode when two Xanders were needed, so maybe they don't care, but I think I would.
The spin-off concept doesn't really work for me. The show worked more off the characters than the environment. Doing it all over again with a shuffled deck could be fine, but it would be a long, hard sell to convince people that a new batch of characters were worth their time. I think it probably needs the old gang to work, but their story got told, and I don't think there is anyway to go back in a satisfying way. Heck, they killed off most of my faves. Unless they got resurrection happy, which I don't approve of, I'm not sure there is anything left for me, and I'm the target demographic.
If you could pull it off I do like the idea of Faith taking point in a self serving sort of way. Philosophically though I don't like it. You can't just rotate in slayers to lead a show without watering down Buffy's significance. You make a show about a girl with her name on it because she's supposed to be super important, unique; maybe even one of a kind. She's not the only slayer now, but she can stay unique through her contribution. That is unless someone makes another show about a vampire slayer that saves the world and stuff.
I am tempted to agree with you about the Angel being better part, but I'm not sure I really believe it deep down. I feel like they were pretty equal to one another when taken as whole, and it's tough for me to pick winners there. I do think Buffy went through more of an evolution by getting progressively more adult and dark. Well, S4 and S5 were probably the lightest tonally from what remember off hand, but through S6 and S7 I think it got every bit as dark as Angel got. In fact I had a lot of trouble dealing with Buffy S7 and Angel S5 with how dark they got, but I've only seen Buffy S7 the one time while I have re-watched Angel. I think Angel feels more adult or darker because it started out a bit more so than Buffy was at the time Angel Season 1 aired. They both got heaver and I think it happened at roughly the same time. I would probably have to re-watch everything to make sure I still felt that way, but that's how I am remembering it.