Silicon Valley, especially its San Francisco wing, is richer and more powerful than ever. Yet there are growing murmurs—underscored by plateauing new-jobs numbers and housing prices, street protests in San Francisco over the new ‘plutocrats,’ the lack of exciting new products and a decline of early-stage new investments—that Silicon Valley has finally peaked and begun the downhill slide to irrelevance.Slide? Perhaps. The Valley has always been characterized by a four-year boom-bust cycle, and the electronics industry is overdue for such a downturn. Yet there is very good reason to believe that not only will the Valley return bigger and stronger than ever, but that it will further consolidate its position against all comers as the World’s High Tech Capital. Here’s why:• Success breeds success. A major new report being prepared by the Silicon Valley Competitiveness and Innovation Project has found that the region’s dominance is still decisive and growing. While a decade ago the nation’s various tech centers showed a relative balance in creating high-value companies, Silicon Valley (including San Francisco) has now jumped far ahead. The average worker in Silicon Valley generated 50% more output per year than the average U.S. worker in 2012, according to Collaborative Economics Inc.