The recent decision from Newsweek to shift its coverage from a focus on current event news to opinion-based content amid falling sales signals that the magazine is hitching its survival on growing its core demographic of readers, at the expense of the mass market.

“Mass for us is a business that doesn't work,” Tom Ascheim, CEO of Newsweek, told The New York Times on February 9. “[We] wish it did, but it doesn't. We did it for a long time, ...