There is no good reason for the Doctor (Doctor Who) to regenerate as a woman.

Firstly we seem in agreement that there is nothing stopping the Doctor from regenerating with two X-chromosomes instead of one, thus my first goal is accomplished.With that complete, I'll proceed with reply to last rounds points, then focus on reasons for the doctor to become a woman.Character focus - "We can always revive a female Time Lord if necessary."He used to have a female Time Lord companion named Romana. A script editor decided it would be funny to have her waste a whole bunch of her limited regenerations "'trying on' different bodies instead of different outfits" [7], which needless to say is badly insulting to women. Worse Romana was not injured or otherwise prior to doing this.Doing a female Time Lord properly would be essensal to correct such a huge blunder. With a very limited number of time lords remaining (having more show up as randomly would lessen the value of the Time War), the Doctor would be the best choice to redeem themselves. Doubly so since the focus of the show would not become divided by a contest of which Time Lord is best.As for issues a female Doctor could explore... The entire other half the the human emotional experience for starters. We have had 50 years to see a make time lord in depth, he's had kids and grandkids, even had to kill them, and suffer the pain. The pain of a father is different than the pain of a mother. Since pro asserts the show must only explore subjects "appropriate for a family audience," families like shows about mothers, and women having babies. Doctor Quinn Medicine Woman being a great example; The Doctor could have babies, missed periods, and other lessons to help girls grow up; all while still being the strong lead on the show; and keeping the audience endlessly entertained. Not transgenderedThank you pro for correcting my mistake, fetuses actually have both male and female tubes developed inside them; as your source confirms. Making human sex differation even more confusing. But I do agree, unimportant to this debate. Point dropped.Blind casting - "the Queen must be an old white woman, not a young black man"What a terribly racist No True Scotsman fallacy and Appeal To Tradition (should we stick with trying to bleed the fever out of people, since that's how it used to be?; and utterly not on Doctor Who where the Emperor can be a midget, and the Queen Regnant doesn't need to be old or white; heck she can be a reasonable young-ish black woman [8]. (old white woman?)Opening the door to women in casting selection, doubles the potential good Doctors choices to be found, in turn likely increasing the quality of the show (assuming there are talented female actors, which I do).Fan InterestFrom pro's source "Mandys Law On Anime Gender Bending," Doctor Who is not an anime, the source is entertaining be off topic.Also The Doctor has already been a woman, in award winning official comic; he did not stay that way long, but I've heard of no outcry against it.New Point: FunIt would be fun! Which is the very reason to watch the show to begin with. Just imagine the Doctor outsmarting old enemies, who mistake the male companion for the doctor.Plus it would not upside any families if the Doctor and Captain Jack Harkness flirting lead to something, the way it might with a male Doctor. Sources:[7] http://www.shannonsullivan.com...[8] http://tardis.wikia.com...[9]