Just weeks after ESPN laid off about 100 journalists and on-air commentators, the "Worldwide Leader in Sports" unveiled a new programming slate on Tuesday filled with big personalities but short on the kind of highlight shows that for many years were the foundation of the network.

The revamped lineup underscores just how much the changing media landscape has unsettled even the world's most powerful sports company. Once the undisputed king of sports programming, ESPN must now contend with companies like Google, Amazon, Facebook and Twitter, which not only offer statistics and highlights at the click of a button but are also increasingly offering the games themselves.

And in a world where viewers can catch a must-see play on Facebook or stream an entire football game on Twitter, who needs a traditional highlight show like "SportsCenter" that focuses on highlights and updates like player injuries and roster moves?

"We at ESPN are optimists," John Skipper, ESPN's president, said on Tuesday at the network's annual presentation to advertisers. "Of course, the current environment forces us to be realists as well as optimists."

So ESPN is shaking things up.

The theme was a bet on the power of the network's personalities. ESPN formally announced several new shows — including a three-hour morning block with the longtime ESPN host Mike Greenberg, and one that will feature the commentators Bomani Jones and Pablo Torre. In an apparent effort to draw viewers to "SportsCenter," its crown jewel since 1979, ESPN has retooled the show, tying time slots to specific anchors, including Kenny Mayne, one of the network's best-known personalities. The show will not air at all from 7 a.m. until 6 p.m. on ESPN's main channel.

The network has also signed new deals with other ESPN veterans, including Sage Steele and Hannah Storm, who will have a new role that includes hosting prime-time specials. Ms. Steele will host a three-hour morning version of "SportsCenter" on ESPN2.

In an effort to meet viewers on their various devices, the network announced SportsCenter Right Now, short news updates online and twice hourly on ESPN during the day. During the presentation, Mr. Skipper highlighted ESPN's inclusion in television packages offered by the likes of Sling TV and Hulu.

ESPN's efforts to adapt to the digital age are indicative of broader challenges facing cable television. Cord-cutting has accelerated sharply in the last quarter, with traditional cable and satellite providers losing 732,000 subscribers compared with a loss of 102,000 in the same period a year ago, according to research by Michael Nathanson, an analyst at MoffettNathanson. Lower-priced "skinny" online packages of channels have not made up the slack.