I still don't think they will.

I'm not one of these people who thinks Joss doesn't like Spike (or Angel), incidentally. I just think - as you say - that he's said all he has to say about them. Just my tough luck, I suppose, because I don't find the scoobies that interesting (except Buffy herself) and without the input of such characters - or at least some other ambiguous character with edge, like Dracula - I am just bored with the story.