NBC Universal and Fox this week launched Hulu.com, a Web site that will significantly increase the amount of video the two networks offer online for free. You will find recently aired primetime shows on the site.Some media have focused on whether this presents a new challenge to YouTube or even iTunes. But the unreported story, I think, is how the networks continue to undermine the affiliate TV stations that carry the shows. The online videos present one more reason for people not to have to watch the programs on TV. And when the videos move online, the local station is left completely out of of the transaction.