Nielsen will change how they measure TV viewing as ratings continue to drop:

Despite the May axing of 19 first-year series and such surprise dumpings as ABC’s Castle and Nashville, cancellations are proving rarer, even as linear ratings shrink. That’s because, of the 60 returning scripted series to air on the five main broadcast networks this season, only one finished with improved ratings from the previous year. And that show premiered in the ’90s. Law & Order: SVU‘s modest gain, up an incremental 4 percent during its 17th cycle, is a case study in how the industry standard week of DVR and on-demand views doesn’t provide the most complete narrative any longer — or at least not one that the networks are eager to tell.

“We have found that audiences continue to grow beyond seven days in every instance, some by 58 percent among adults 18-to-49,” says Nielsen audience insights senior vp Glenn Enoch. “Growth after seven days is consistent, but the rate of growth varies by genre. Some programs need to be viewed in the week they air, while consumers use on-demand libraries to view others over time, like animated comedies and episodic dramas.”

To that end, on Aug. 29, Nielsen will up the turnaround on live-plus-7-day reporting (no more 15-day wait time), offering daily rolling on time-shifting, and it will start extending the tail past the long-established extra week of views. The measurement giant announced in March that the window for regularly reported on-demand and DVR data now will extend to 35 days after the original airdate.

The extra draw between weeks two and five is not minor for many scripted series. Grey’s Anatomy, again ABC’s highest-rated drama in its 12th season, saw its live-plus-7 average in the key demographic drop 3 percent from the previous season. But the 35-day trail of VOD (with online streams) adds another 1.5 rating points among 18-to-49, making for a 6 percent improvement from the show’s 11th season. (Of note: 1.5 is the complete live-plus-7-day rating for Thursday neighbor and surprise renewal The Catch.)

Certainly viewing habits have changed in recent years as viewing options proliferate. But, it is hard also not to see this as an attempt to chase numbers to provide advertisers (which leads to more money). If only one show showed an improvement from the past season (and a Law & Order in its 17th season), change the system of measurement. Perhaps this is the true acknowledgment that television will never be the same: the best solution to declining ratings is not to put together better content or to put together a new consolidated model but rather to chase viewers to all ends of the earth.