If Bruce retires/isn't rehired I think they should give Tess first refusal on the main job; after all, she proved last year that she is more than capable of the main show. It would also give them the chance to revampp the show slightly; bring in a new cohost, maybe make the backstage area more like the new DWTS one, yet retain enough elements that it's not a massive change - like the main studio layout, judging panel, that sort of thing.
As cohost, I actually don't want Claudia to do it - I want her to stay on ITT and I dount she'd be willing/able to do ITT, main show, Radio 2 show, and Film 2010. If they were to go for split-gender hosting, I actually think Anton would be okay in the backstage reporter role (but definitely not as the main host!); he has a certain chamn about him that I think would work quite well backstage. it would llaso get him off the dancefloor except for special occasions like the final, and the odd-demonstration routine (like how, again I think DWTS) has on-competing pros from other seasons do some of the pro-routines.