In Arizona we are already hearing the Sun Corridor term used.
However, I’m not sure if I would put the Central Valley of CA in with the San Francisco folks...:)
These mega regions are being planned so that the richer surrounds to decaying cities, in other words the suburbs, will be merged to “share” transportation, services, educational units, etc.; in other words they will pick up the tab for the cities. Another income distribution scheme to soak those who escaped the cities in order to finance those very same cities. Beware folks, of what they are trying to do.