For a few hours last Tuesday, the entire news business seemed to be collapsing all at once. Journalists at Time magazine and National Geographic announced that they had been laid off. Unionized employees at magazines owned by Conde Nast staged a one-day strike to protest imminent cuts. By far the grimmest news was from the Los Angeles Times, the biggest newspaper west of the Washington, D.C., area. After weeks of rumors, the paper announced that it was cutting 115 people, more than 20 percent of its newsroom.