I don't watch the programme, so I have no axe to grind at all.
If the BBC thinks it needs a re-fresh, then they may be right, as I say, I have no idea if the format, or the presenters, are looking past it.
Likewise, with no names in the frame for a change, it's a little early to be getting knickers in a robble about the possible ethnicity of the replacements.
The new people should be chosen on merit, and if it is abundantly clear that they are not up to the job, but chosen for their colour, that's the time to make a noise about it.