https://www.gamespot.com/articles/single-player-games-are-not-dead-but-the-economics/1100-6454339/

Xbox boss Shannon Loftis, who heads up Xbox Publishing for first-party games, believes single-player-only games aren't dead but they do have questions to face around their economic viability. Speaking to GameSpot today, Loftis said the demand by gamers for higher quality experiences comes with a price tag. While storytelling is still of paramount importance, the economics of single-player-only titles is "complicated" in today's industry due to the dramatic and constant evolution of the game market.