If the career of Roger Fidler has any meaning, it is this: Sometimes, you can see the future coming but get trampled by it anyway.

Thirty years ago, Mr. Fidler was a media executive pushing a reassuring vision of the future of newspapers. The digital revolution would liberate news from printing presses, giving people portable devices that kept them informed all day long. Some stories would be enhanced by video, others by sound and animation. Readers can share articles, driving engagement across diverse communities.

All that has come to pass, more or less. Everyone is online all the time, and