And it really does seem that the media - if not necessarily the networks - continue to think that Neilsen ratings are the only real measurement to go by, even though shows like V have been proven huge in time-shifting and downloads. And the public reads this, decides V isn't worth watching because a) it's bad because the ratings are low or b) it's dead so why invest time to watch a dead show.
See this post by a SVP at SyFy. The Neilsen's still do make 90% of the difference. At the end of the day all that matters is the money the network makes, and DVR viewers don't watch ads, while online viewers generate pennies on the dollar. Until that changes networks will continue to make decisions based on Neilsen ratings.