More worrying is the slide for “Morning Joe,” which has, for much of its time on the air, enjoyed status as one of the most talked-about shows in media industry circles. Now the heat around the show seems to have dissipated. For four straight months, and six of the last eight, “Morning Joe” has trailed CNN’s new morning entry, “New Day.”

One longtime news executive who has worked for both network and cable news organizations said the problem with “Morning Joe” was partly a broader issue with MSNBC. “ ‘Morning Joe’ has been hurt because no one is tuning in to watch the channel now; they go right by,” he said. “The show took its eye off the ball, but you can’t discount the fact that nobody is watching the channel.”

The executive, who asked not to be identified because of potential future business with MSNBC, said Ms. Maddow remains a draw, but her format has grown tired. “In terms of Rachel, everybody knows every night what she’s going to say,” he said. “The network just doesn’t surprise you.”

MSNBC’s other numbers are no prettier. Over all in prime time, MSNBC, which for years had squashed CNN head-to-head on weeknights, has recently dropped consistently behind that network. The falloff over the last five years is stark. In the first quarter of 2009, MSNBC averaged 392,000 viewers in the 25-54 demographic for its weeknight lineup. In the third quarter of this year, the number was down to 125,000.

The network’s newest prime-time host, Chris Hayes, also hit a low in the third quarter, averaging 129,000 viewers in the 25-54 category, his worst since his show began in the second quarter of 2013.

The median age of the MSNBC viewer has also ticked upward. Five years ago it was 58; now it is 61. CNN has edged down a bit, from 62 five years ago to 59. Fox News has aged from 65 to 68.

On Monday and Friday of last week, only one MSNBC show all day, “Hardball” with Chris Matthews, even topped 100,000 viewers in that 25-54 group. And the daytime numbers are much worse. Mr. Farrow’s show averaged just 45,000 viewers in the preferred group, down 51 percent from other programming in the same slot last year.