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

This question is the same as any other of a hundred about a casting choice; why?While I'll trust the creative team's decisions, there remain many valid reasons why.Firstly why not? Why have that accident instead of another one? Why have that hair color instead of... and onward.Choice:Regeneration has over the course of the series, been proved to some extent to be willfully controlled. Such as the master refusing regeneration (in effect committing suicide) [1]. The Doctor growing a new fighting hand [2]. River Song pouring all her remaining regenerations into The Doctor [3], then proceeding to use her remaining traces to age in reverse.If a Time Lord wishes, they could likely force their next regeneration to have details they want (the Doctor fearfully checks to ensure he still only has one head following regenerations).Accident:Repeating many of the sentiments above, there is a chance each time a Time Lord regenerates that they have any feature. The Doctor himself once briefly thought he was a woman following a regeneration [3]. Each time a Time Lord dies, they roll the dice (yes I believe they can also force exact details they want; however the Doctor has tried and failed to become a ginger). The odds of becoming a woman are equally small each time, yet the odds slowly stack making it more likely to occur.Sex is the smallest matter of differences in DNA, the Third Doctor randomly had precise tattoo [4].The Corsair:One of the Doctor's friends, known for switching sexes. Described by him as "one of the good ones" except when female, then "she was a bad girl" [5].Blind Casting:The Doctor is a silly alien shape changer, that manipulates people. The Doctor could bare in any appearance... Casting should not be limited to White/Male. Morally casting should be open to any performer with the right talents. Prior to playing River Song, Alex Kingston (as one example) would have made a great doctor. Character Focus:There are many interesting things they could explore with a female time lord; however with the focus of the series being on The Doctor those ideas would get diminished attention. By the female Time Lord being The Doctor, the show would remain fully focused on the title character, while being able to explore new territory thus staying fresh.Not Transgendered:When a Time Lord regenerates, it is another potential them freshly born. If anything it would actually de-transgender The Doctor, since all men started with female sex organs in the womb before going through the hormonal changes thanks to the y chromosome switching them to male. Thus if basic biology is to be believed, The Doctor has always been transgendered. A female Doctor Who would be the first non-Transgendered one in the history of the series.Fan Interest:Best exemplified by former series star John Barrowman praising the idea, then adding "Give it a whirl, if it doesn’t work she can always regenerate, she can always regenerate back to a man" [6].Sources:[1] http://tardis.wikia.com...[2] http://tardis.wikia.com...[3] http://tardis.wikia.com...[4] http://tardis.wikia.com...[5] http://tardis.wikia.com...[6] http://www.radiotimes.com...