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Football, America's biggest prime-time powerhouse, has been thrust into a crisis this fall, with dwindling ratings sparking questions over whether it can remain a gold mine for television in an age when more Americans are abandoning traditional TV.

Network executives have long used the National Football League's live games as a last line of defense against the rapid growth of "cord-cutting" and on-demand viewing upending the industry. But now, the NFL is seeing its ratings tumble in the same way that the Olympics, awards shows and other live events have, falling more than 10 percent for the first five weeks of the season compared with the first five weeks of last season.

Football's traditional TV audience "is never going to be what it was again," said Brian Hughes, a senior vice president at Magna Global, which tracks audience and advertising trends.

Network and league executives are scrambling to identify causes. Many have pointed to the 2016 presidential campaign, which has led cable-news ratings to explode. Election years often thin sports ratings, but the NFL has never seen a drop as dramatic as this year's, Nielsen data shows. During the first five weeks of this year, ratings have declined 15 percent compared with the entirety of last year.

In an internal NFL memo sent last week and given to The Washington Post, two league executives, Brian Rolapp and Howard Katz, wrote that "all networks airing NFL games are down" and that "primetime windows have clearly been affected the most."

They pointed to "a confluence of events," including the election, to explain the ratings slide. "While our partners, like us, would have liked to see higher ratings," they added, "they remain confident in the NFL and unconcerned about a long-term issue."

Other weaknesses have plagued the NFL. Some of the league's top players have retired or have been suspended, including Peyton Manning, Marshawn Lynch and Tom Brady, creating a star-power vacuum.

"Sports at the end of the day is a narrative. You can't create it. It's organic," said Neil Macker, an entertainment analyst for Morningstar, an investment research firm. "If you don't have those compelling story lines, people aren't going to take the time to watch."

Football last year was still TV's biggest golden goose, with the Super Bowl and other games locking in many of the most-watched hours on air. Its viewership grew in recent years as ratings fell for many of television's other genres, including scripted dramas, which are often expensive to produce and yield more limited viewerships.

Some advertisers said they were content to wait and see whether the season's ratings improved in coming weeks, believing there were few better options among other sports or TV programming on which they could buy ad time.

"In a sea of very low-rated programs, to have the NFL be so dominant even with these depressed ratings, its still something we value," said Andy Donchin, the chief investment officer for Amplifi US, a division of the ad-buying giant Dentsu Aegis Network.

Football's watched-live tradition has long drawn in advertisers put off by commercial-free networks and streaming services such as HBO and Netflix. The games' format also gave advertisers confidence that their spots would actually get watched, not just fast-forwarded through later via DVRs. But an exodus of cable subscribers, turned off by high cable bills or won over by the growing number of on-demand streaming options, has shunted much of the NFL's long-established power toward the Web.

Long-term slides in ratings pose a financial minefield for the big TV networks, which have agreed to pay the league tens of billions of dollars to air NFL games through 2022.

The networks do not make enough ad revenue to fully cover those arrangements, according to an industry estimate provided by Magna. But they believe the promotional halo of having NFL games leading viewers into other programming makes the deals worth it. Falling viewership, however, could drive down ad revenue, making the networks' calculations harder to defend, Hughes said.

Streaming services catering to sports viewers on the Web have seen their subscription numbers climb. Sling TV, a Web service that offers ESPN and other live sports starting at $20 a month, has seen "extremely strong growth," said Ben Weinberger, chief product officer. With every live sports event, Weinberger said, they see more new sign-ups.

The Web-motivated trend toward short, punchy online videos, analysts said, may have also motivated some viewers to skip the four-hour broadcasts until they've been distilled down the next day.

The NFL has increasingly chopped up its own highlight videos of big hits and touchdowns, some of which are published through deals with Twitter, YouTube and Snapchat, in hopes of keeping viewers intrigued.

The ratings shift has other sports giants taking notice. Bob Bowman, president of business and media for Major League Baseball, said the league has invested heavily toward grabbing fans wanting to watch games over the Web. has seen its user base grow about 17 percent a year. League executives, Bowman added, don't expect viewers will ever return en masse to the traditional way of watching games "in one way on one device — a TV screen that lived on your wall."