I'd never suggest that any of the pros are anything but fantastic at dancing, but personally, from what I feel they contribute to the show (in terms of dancing, TV personality, teaching, and choreographing) I would like to definitely have:
Erin (Yes, I know, not-good-at-latin-etc - but she's choreographed some latin dances better than the latin specialists on the show, and her latin is never going to impede her dance partner at this kind of beginner level. Plus, she's one of the best teachers on Strictly. If, however, they replace Bruce with Anton, Erin for judge!)
Artem (I've really enjoyed his choreo this year; some really interesting and compelling routines produced for Kara. He may, however, be less appealing with a less talented partner)
Katya (I'm iffy: Katya's actually one of my favourite pros and I have no idea why! She's an ok teacher, an ok choreographer, she has an odd sense of humour...yet I just love her

)
Ian (Good teacher, good choreographer, good fun - what's not to like)
I'd also be keen on seeing:
Anton (I'm not his biggest fan but I can see his appeal to much of Strictly's audience. He's one of the biggest names among the pros, rightly or wrongly, and he does tend to build up a good rapport with his partner most of the time)
Natalie (Not really a fan but I can appreciate her choreo and her drive to succeed)
Kristina (She was very sweet with John Sergeant. I'd like to see her get a chance with someone with some natural talent, poor thing!)
James (I'd rather him over Brendan in the 'bad boy' (yawn...) stakes; he seems like a fun guy and not actually stroppy like Brendan gets sometimes)
Ola (The men would get so angry if she were cut

I feel like she's really come out of her shell in terms of choreo and personality over the series)
Vincent (He's such a character; I like that he brings a bit of cheekiness, and he always seems to get on with his partners. Some really nice routines too.)
Matthew (I like him. I mean, I don't love him like some of his most ardent fans, but he seems like a lovely person and a good teacher and choreographer)
I'd also perhaps like to see Brian, Lilia, Karen - oh hell, it's quite obvious that I love almost all of them
NB: Tall Paul and others who have become so defensive of one particular pro: like you say, it
is the producers, not us, who decide. So surely it's ok for us to voice our opinions of who we'd like to see and who we wouldn't? I mean, take Aliona for example: I wouldn't be fussed if she were cut because I feel her teaching style and choreography perhaps aren't best suited to the Strictly environment but that doesn't mean I'm mean about her / I hate her / I'm jellus or that I can't appreciate her cute personality or imaginative style. Many people have said they want to see the back of Erin; personally, she's my favourite pro, but I'm not going to jump down people's throats for voicing reasonable and polite opinions.