Fans and several former Time Lords, including Sylvester McCoy and Peter Davison, have historically argued the Doctor should never be a woman—often citing tradition or general traits innate to the character's gender. The belief is that the Doctor's masculinity is a core trait that defines the character, and any attempt to fiddle with that dynamic is just stunt-casting.
The Doctor is male and, while precedent was set in the series for Time Lords to change gender, in the real world such a change would destroy ratings. Some would argue the programme revolves around change – and that’s true. But making the Doctor female would do no more than tick an “equality” box. If Auntie Beeb wants a female Time Lord, then give us a spin-off – we’d welcome it. Just don’t mess with our boy!
After three seasons of Peter Capaldi, "Doctor Who" was in need of a makeover. The series has been in a bit of decline, as it struggled to write for a fifty-something Time Lord for much of Capaldi's tenure. The youthful energy of David Tennant and Matt Smith reinvigorated the series, but fans moved on as the show became stagnant.
BBC's bold move to cast a woman as the thirteenth iteration of Gallifrey's friendly, neighborhood Time Lord is just what the Doctor ordered. Fans have been calling for a female Doctor for a while. It's only fair! How many white men can you watch before it gets repetitive? As Ross Ruediger from Vulture writes:
In order to stay relevant, Doctor Who must continue to reach for the stars and do things that make it stand out from the pack. It’s no longer enough just to be the oldest sci-fi series on TV. Making the Doctor a woman wasn’t just necessary, it was inevitable.
Every time I see Jodie Whittaker's new costume, the more and more I love it. It's odd, and looks like something straight out of 70's kids TV presenting, but it's very Doctor Who. Bring on next year. #JodieWhittaker#DoctorWho
If you think the new Doctor Who has a shitty outfit, fuck off out of here right now. She's dressed PERFECTLY. It's literally perfect. This is the first time I've had any interest in DW in YEARS. I LOVE HER