In interesting news today, California is now at the very bottom of the top ten states for wealth. The continued prosperity of the East Coast is beginning to look a lot like a strong argument for density. Density has historically been a critical way of bringing ideas together. For a while it looked like California was an attempt to show how prosperity could work with lower density population patterns.
We'll see if this is a trend or an isolated blip, but it doesn't bode well for the West Coast pattern of settlement.