It depends, because so long as there are duffers for celebs, I don't necessarily mind the current line-up.
But if it's based on giving each celeb the best shot at winning then I would say:
James and Ola are looking very tired choreographically. I think in Ola's case it's because she consistently gets the poorer to middle-range celebs so I would like to see her get the ringer next year to see what she comes up with. She did manage to win with a middle-range celeb so I wouldn't write her off yet. James on the other hand seems to be given a lot of talented partners, but he wastes the opportunity. He either goes down the safe, boring route or makes a complete hash of it with his use of props. I would not be sorry to see him go.
Anton and Erin are looking very weak in the latin, especially now that the BBC has recruited outstanding latin dancers like Pasha and Artem.
Vincent and Flavia have great choreography in them, but they keep getting partnered with the duffers year after year. I want to see them with better celebs next year.
I'm not really sold on Pasha - I think his routines are too complex for celebrities to dance. Obviously he has done a great job with Chelsee though, but I feel that different choreography might have shown her in a better light. I adore Katya and I am desperate to see her get a good partner - fingers crossed for next year.
Aliona and Artem have really earned their stripes over the last couple of years - I would be very disappointed if either of them didn't return for the next series.
Brendan and Natalie have really grown on me as personalities, but I don't rate Brendan as a choreographer. Natalie is great but I find her very distracting in hold because IMO she leans too far back.
Kristina has to stay really, she's definitely one of the more interesting choreographers. I feel Robin is quite weak in all areas - dancer/teacher/choreographer though he's obviously a lovely guy. If he was to stay then it should only be to teach the duffers.
Overall, I think Katya, Ola, Vincent, Kristina and Brendan are probably due a good celeb next year.