I really don't think that a Big Bad for what is supposed to be Buffy's final (again) season. Almost certainly, a large portion of the season will be centered around Angel and his search for some small degree of redemption for his part in everything that happened in Season 8. Beyond that, if this really IS going to be the final season, which I personally doubt) I think that it would be at the very least courteous to his fans, who have remained faithful for all these years, if Joss would give some closure, not just leave things hanging again, the way that he seems to love to do. I personally don't want to see Buffy ruin her life by ending up with Ol Broodie, but if that's the way that the story ends, then, by god, let's END IT ALREADY. Xander and Dawn, couldn't care less. He probably deserves her anyhow. Willow and Kennedy, I shudder to envision as being permanent. but, as long as I don't have to see it... Give Faith somebody to keep. No more one nighters. If that winds up being Spike, I can deal. Just don't leave the kid hanging out there all alone anymore. She deserves happiness as much as anyone, and maybe even more than some of the others.
Illyria, Gunn, Connor, and whoever else manages to survive the move from IDW to Dark Horse, let them all have happy endings, or if not actually happy, at least leave them hopeful.