That’s a rash argument. You obviuosly haven’t spent much time here. The comparison here has been with San Diego and its historical figures, not comparing to Autsin or Detroit. (Although Austin is ranked #1 in creativity and mean income is not far lower than San Diego)
Check out Rich’s graphs. If you want more official evidence go to John Burns http://www.realestateconsulting.com, a leading consultant to the home builders. He has in depth data on every city for $400, but occasionally offers free summaries. He is not bearish (or bullish)on SD, but does worry about low paying new jobs and condos.