For me, I love the Tess / Claudia combo. The dancers all make a point of it being a strictly "Family" and rather than replace Bruce with a step-dad I think we'd all be happier with just Mum and the mad, batty aunt. The BBC should think v-e-r-y carefully on who should replace Bruce, and what a mistake Ronnie was.
The one thing Bruce has that nobody can take away from him is his ability to control and work the audience. Tess doesn't have this (as yet) and that's the thing I missed him for. There were occasions where the audience wouldn't be quiet enough for us to allow Tess to be heard above them. Bruce would either use timing to wait until they had subsided, or use his audience working skills to shut them up one way or another. I don't know of many people that DO have that vital ability. Certainly not a lot of the comedians people are suggesting. But I think given chance, Tess would shine and obviously Claudia is such a hit they would be mad to not use her!