YouTube would be a better site if they just removed the feature. Let it spill somewhere else. Why should I have to read comments like that on a video that has done nothing to invite them?
Write a Greasemonkey or Userstyles script to hide them. Problem solved. I do that kind of stuff all the time to fix busted "modern" web interfaces (low contrast text, insane amounts of padding, important interface elements that only display on rollover) for web sites I use regularly.
Google probably has a financial incentive to keep YouTube comments around. You don't have to read them at any rate. And the video did invite the comments because it featured a woman.