It's fresh right now, there'll be an expected hue and cry about the poor guy kicked out of a plane, and to be honest he did the best he could be getting dragged out and getting it filmed for his own position, but legally that still gives him no more grounds to sue anyone that he would have otherwise. It all boils down to how much the airline feels the media pressure if this goes further, which I wouldn't be banking on personally. For one, the video is already out there, whatever 'damage' was to be done has already been done and there's nothing more he can add to it, there won't be any million dollars going anywhere. In fact, far bigger airlines than United would make a person even with this mileage work hard to get the basic compensation for his 'inconvenience'.