-- rockers, politicos, Internet moguls -- playing for an audience with more than its share of affluent, literate people, on a stage rich in history, eccentricity and natural beauty. It sounds like a journalist's dream, a great market for a news organization. Yet extinction threatens The San Francisco Chronicle, the leading local news source. The Hearst Corporation says the newspaper lost about $1 million a week last year, and it must either sell the paper, close it or lay off a large part of its already diminished staff. [ABSTRACT FROM PUBLISHER]