The San Andreas itself is much further from densely populated areas than the Hayward, which runs right through them (though people are rapidly moving further out, closer to the San Andreas.)
Overall there's been an effort by geologists to reduce the focus on the "Big One" on the Southern San Andreas (and they really tend to avoid the term anymore, as it's misleading) and more on threats closer to populated areas...many of which, especially in Los Angeles, have been recently discovered.
The San Andreas is no longer the worst-case scenario.