There has been some discussion online about the possibility of the new doctor being a woman. Certain groups think that would be wonderful. I'm not among them. This is why:
1. The Doctor is a mad man in a blue box. He always has been. I'm a huge supporter of leading women and well-written female roles, but the doctor has always been a man, and should remain so. Tradition isn't a bad thing, folks.
2. If you think he should become female because that might make the show more "fair" or "balanced" or some cockamamie thing like that, you are missing the fact that the show has a multitude of strong, amazing women. River Song, and so many of the doctor's companions, as well as various side-characters (including many aliens and villains) are written to be equal to the male characters in strength, humor, courage, and story. We're covered, ladies.
3. Changing something as huge as this to appease a noisy, obnoxious minority would be a bad idea. Giving people anything they want, just to appease them, is never good for society (or people!). And it wouldn't be good for the show.
4. Canon. From Dictionary.com (especially #3,4 & 5):
an ecclesiastical rule or law enacted by a council or other competent authority and, in the Roman Catholic Church,approved by the pope.2.
the body of ecclesiastical law.3.
the body of rules, principles, or standards accepted asaxiomatic and universally binding in a field of study or art: theneoclassical canon.4.
a fundamental principle or general rule: the canons of goodbehavior.5.
a standard; criterion: the canons of taste.