Harassment goes well beyond trolling, and so does the specific targeting of women.
I can imagine fixing the more common problems, like pervasive stupid sexist comments everywhere, and inappropriate content in conference presentations, but stamping out every single rare-but-extant crazy stalker seems unlikely. A number of high-profile bloggers, Usenet posters, and forum admins of both genders have attracted unhinged people of that sort, and discussion about what to do about the problem dates back at least 20 years.
I respectfully disagree. Sometimes you really just can't fix stupid.