How would they make any money from it? In my experience, the average person who watches TV has no idea what a domain is and would be very unlikely to watch it. I'm guessing an audience on the satellite "Information TV" channel may be larger!
It would be good to see someone do something though, but how do you identify the domainers and get a sufficient balance of views? What topic do you cover? Most who have any idea associate domaining with cybersquatting and I can see that this would make a "good" documentary due to the potential criminal activities, but good honest domaining (which most of us are involved with) doesn't make a very saleable story.