Actually, I think that there has been a mass exodus from CA going on for quite awhile already.
Many, many people have left CA and moved to surrounding states because of the economy. Idaho, Montana, Oregon, Nevada and Arizona are the main relocation spots and even though this exodus has not been one huge publicized event, people have been "trickling" out of CA for many years now. The towns people in Salmon ID for instance, were always complaining about the influx of Californians into that town, way back when I was living there!
Hamiltion MT is another of the hot spots for CA relocation.
So it is happening, and has been happening, but is maybe just not so noticeable as to be on the news yet.
People in those surrounding states are well aware of it and have been complaining about it, for quite some time already though. Maybe if someone were to check with the realtors in those areas, it could be confirmed easy enough.