FlightPathOBN, POR was moved to the West Coast around 2007. If you look at your map there is a little green dot that covers Japan and as we know, WAAS is transmitted from a Geosynchronous orbiting satellite. The Japanese Ministery of Transport MTSAT! Australia only has to put in the monitoring infrastructure.
I am looking at the benefit of the entire continent. WAAS is more suited than GBAS, you have to admit that. If you are purely talking Autoland capability then by all means GBAS is a far better proposal than a purely ground based CAT III system....as long as someone is willing to pay for it.
As for your list? Not many B58s or PA31s running Proline is there?