Before my wife and I got married she was scared of guns, she has since learned to use them and respect them.
She has on numerous occasions told me that people in her home country never carried guns. My response to that is usually something to the effect of "Less people would be victims of crime if they did."
She has come to respect firearms and value their use in self defense. It took years just to get her to be comfortable around them. Maybe in a few more years she will actually start carrying her own handgun.
I think the idea of people suddenly becoming pro-gun overnight is possible, but most likely won't be the case.