Karen won't come back as a dancer as she (along with Camilla) left the show of her own accord. Lilia quit herself too, but I doubt she would have done so if she hadn't been demoted to a Dance trouper. On that note, the Dance troupe maybe need to go, unless they are utilised much more next series. It seemed pointless for them to dance so little despite having more time to choreograph dance routines than the celeb-coupled Pros. If they are going to be under-used next series then prob don't bother.
I would keep all the judges, although I feel indifferent to Alesha so am not entirely bothered as to whether she stays or goes. If someone like Karen or another ex-professional was given the opportuniy to replace her then I'd prob prefer that option.
I would keep all the girl Pros, as I think they all contribute well to the show. But I think next year Kristina needs a good partner or she might just leave of her own accord. Out of the male Pros Jared HAS to GO sadly. He's a lovely guy but I just don't rate him as a Professional dancer, or teacher for that matter. I wouldn't be bothered if Robin went but would rather he stay than someone like Darren come back. I don't have much love for Brendan but I doubt the Beeb would get rid of him or James because of the 'bad' boy thing (even though its a long expired act).
Oh, and Bruce too! Don't get me wrong, I appreciate how long he's been in the buisiness for and that he's doing well for his age, but, his jokes are really bad sometimes if not at times quite rude. If he has no imput in to thinking the jokes up then then the person that comes up with them should go.