Re: If you're all in favour of strong female roles...
"then why exclude shows with strong followings? "
I'm not. I'm more than happy for a show with a strong following to kill off a main character and replace them with a female lead. However in Doctor Who they aren't killing off the main character it's supposed to be the same person albeit with a new body and personality.
I'd also have no problem with a character being transgender if that was clearly the writer's intention from the start. But Doctor Who has regenerated a dozen times now and never been female, suddenly deciding to do it now seems very much to be pandering decision not a planned plot choice.