The idea of stopping to watch a TV show because a woman is a main character is ridiculous to me.
In this particular science-fiction universe the species that is The Doctor has already established having their people changing genders when they regenerate…
An alien who can travel through space & time, has a time machine in the form of a 1950s UK police box, appears to be immortal, fighting some bad actors (and unconvincing paper mache / CGI monsters) along the way, has two hearts, all fine…
…now has a vagina - people get upset and say they are going to stop watching.