No chance for WSCB 2010 but we have been doing the Western States Cobra Group yearly (smaller gig) along the Pacific Coast Highway (CH1) the past two years. I'm sort of investigating something else a bit different once again for this year if it comes together. Should know something more in a few weeks. Nothing for sure, we'll see.
The short answer to your question is the economy started taking a hit, many of the stars were no longer lining up, a few of the core team members had to move on and less desire to put it together again in large-scale format for several different logistical and risk reasons. A few of us who attended every year also came to a concensus we had all sort of "been there done that" and looking for yet another discovery and compelling reason to pull it together like it was. As it turned out, was a very smart and timely decision for the time period. We let WSCB (as we knew it) go out with a bang, at its peak!
Many from the 1st-year founding WSCB participants still keep in touch from time to time and do a smaller 50-car gig at different places every few years. Keeping an open eye and discussing some ideas right now looking for yet another twist to do.
