Originally Posted by
GDK:
“Wow! 
People seem far less attached to the blue police box (something that's not significantly changed in over fifty years, and which, for my money, is far more iconic for the show) than they are to a male Doctor. Granted, a big majority don't like the idea, but it seems very few would give up watching the show because of it.
Fascinating.”
It was established as early as the second episode of the programme (
The Cave of Skulls, 1963) that the Tardis should change appearance to blend in with its surroundings, but, because of a fault, doesn't. The idea that the Doctor could be (*gasp*) female is, as far as I know, something that was first floated as an attention-grabber for the press by JNT, some 20 years after the programme started. I don't know when the notion that Timelords could change sex while regenerating was first introduced into the actual programme (
The Doctor's Wife, with its references to the Corsair, perhaps?), but it is obviously a mushroom of recent growth, going against decades of tacit assumptions, and, as such, is inevitably going to encounter greater resistance.
It would be easier to compare the responses to this poll with the responses to your "female Doctor" poll, if the proffered choices were the same in both polls.