I don;t want to speak for the board but it appears there is a process of submitting a request for the class to consider the viability of future NA locations. The link detailing the process and expectations is below. I'm sure the board would consider a west coast NAs if it met the criteria and there was good local interest and commitment from the local class/owners to participate

http://j30.us/ubbthreads/ubbthreads.php/topics/12659/Final_North_American_Champions.html