I suppose there's a risk of Goodhart's Law-- any measurement which is used to guide policy will become corrupt.
I called it aggression. I'm not sure that the guy in the video did.
The intent isn't to solve every workplace problem. It's to solve one quite serious problem which appears in volunteer organizations (the video focused on open source projects) as well as conventional employment.
The claim is that a small percentage of people habitually leave the other people (probably the people of lower status) around them feeling miserable, and this is a problem.
Once a mechanism for excluding people who do this is in place, there's a risk it could be used for scapegoating, and I haven't seen any discussion of how that could be prevented.
In open source, competing forks with visibly different attitudes.
http://blip.tv/tech-love-live/osb09-donnie-berkholz-assholes-are-killing-your-project-2464449
This is specifically about why it's important to get assholes out of open source projects, but it applies in general. It includes an analysis of the social cost of keeping people around who frequently make other people unhappy, and in particular a way to balance the social costs (distraction, people doing much less work or leaving, useful volunteers not joining, assholes recruiting other assholes, etc.) of assholes against the useful work some of them do.