According to the BBC http://www.bbc.co.uk/news/entertainment-arts-39093558
'Actor David Harewood has said the next Doctor Who should not be another white man - and has thrown his own hat into the ring...
"It needs to do something different, so I think it's either going to be a black person or a woman. It would just bring a different flavour to it."'
Why does it need 'to do something different'?
Why does it need a 'different flavour'?
Wouldn't the actor or actress who gets the role of the next Doctor rather know they've got it on merit rather than because of their sex and / or race?