Even though the section of the San Andreas Fault from about the Wrightwood area north a couple hundred miles is overdue for a large quake, predicting the timing of such an event regarding short time frames shows itself time and time again to be wrong. The USGS person quoted at the end of the article basically says this same thing. I look at the USGS quake map for California pretty much every night to see the day to day occurances. In any given week there are a whole lot of 1-2 level quakes, with the occasional 3-4 range.