There are some pretty far-fetched events in Macbeth, but no one suggests changing the sex of the eponymous character.
The proof of the wisdom of a female Doctor in Doctor Who will be whether anyone watches.
Or at least whether anything like as many people, in this country and throughout the world, do so.
But first on The Mash Report (execrable, but then I accept that I am twice the age of the target audience), and then on Dead Ringers, the BBC has gone out of its way to insult even the existing audience.
Doctor Who fans, perhaps because there are just so many of them, crystallise in the BBC's mind its own adolescent sense, not of having too few friends, but of having the wrong ones.
That never bothered me. The cool kids and I ignored each other so happily that, when I did have cause to interact with them, then we got along fine. I am still in touch with a lot of them on Facebook and what have you.
But the BBC is the boy who hates his mates, because they are not the mates that he wants, but they are the only ones that he is ever going to have.
Very occasionally, he lashes out. For example, over Doctor Who. Or in the form of The Mash Report.