The article is a factually inaccurate fluff piece...
Most ad blocking occurs in firewalls, not browser plugins, and AdBlock is a mere blip on the radar.
Filing suit against browser ad blocking providers might pan out but when you file suit against firewall companies it'll hit the fan when you go up against the risk of potential security threats.
The best fight against ad blocking isn't legal, it's technological, and merely block visitors that aren't downloading the ads.
Easy enough to do, can be implemented today.