Hmmm. Would BB be Big Brother without Davina there?
I very much doubt it. As much as her increasing woodeness and cringeworthy limp wristed cardholding hand irritates the sticky brown stuff out of me, I quite feel at home with her there. I get the distinct impression she doesn't watch the show as much as she used to and has become more of a puppet on a string for 'people upstairs' and voices in ears. Her interviews were much better in the first few series most likely due to the lack of worry about people sueing for questions they didn't like

.
As a side issue to that I loved it pre 'birdsinging-roadnoise cos theyre talking about something we can't broadcast for legal reasons'. Why the hell screen a conversation of 'white noise' when there are another 8 of the captives to listen to???

That really gets my goat way more than any of the three presenters.

But that little rant might warrent its own little ranty thread of its own!
I don't think its the presenters that need to change as much as the formats. I'm fed up to the back teeth of Dermot prancing about with competitions where so called fans phone in to win prizes. If they had watched a single minute of the show then they'd get more questions right... its not funny, its just sad! I'd much prefer to see the sadness of some of the die hard BB fans we all know are out there. The ones where for most of their lives when BB is on, join the housemates by setting up mini home on their sofas, the ones with shrines to the most hideous and annoying member of the house because theyre so fame hungry theyd do anything for their 15mins of fame.
Lets not beat around the bush here... (not that I tend to anyway) why did I tune into BB all those years ago?
It was new, there were people being watched in a house 24/7 and the coverage was cool, fresh and exciting. They had to play Judas and kick each other out of a gameshow competition to win a huge amount of money for sunbathing and being boring.

I loved it!
What do I tune in for now?
Answer: to smile to myself that I'm not as sad as some other people and to smugly congratulate myself that my mental breakdown asn't infront of millions of veiwers. In short... carcrash telly at its best with three presenters with very specific roles in shows targetting and aimed at varying audiences of varying ages groups.
Possible replacements could realistically be
Davina: Michael Parkinson?
Dermot: Brian Dowling?
Russel: Paul O'Grady?

I don't think replacements are needed, better (or less) scripts maybe?