The biggest problem i see here( in my opinion) is that Blizzard shot themselves in the foot when they gave us Oceanic named servers, a big percentage of oceanic players transferred, and over the years have established themselves in the oceanic gaming community, so if Blizzard were to put oceanic severs here, just think of the mass migration of players that would make them their new home.
There is also a big percentage of US players on oceanic realms, so just think if we were all to jump ship, it would leave massive gaps in realm population, guilds etc, so why not just close the oceanic US based servers you ask? well think about it, it would take a lot of man power, time and cost to do this, not to mention that the US players on oceanic realms would start complaining, as if they wanted to stay with their friends/guilds, they themselves then would be having to jump the Pacific ocean, and just create the same ping based problem for Blizzard.
So Blizzard aren't going to be upsetting the apple cart when it comes to how they have set up the servers, it would cost them more now to do this compared to back when the thought of setting servers up in Australia was first talked about, not cost in setting the servers up here, just the cost of having to try sort out the massive problems that would arise with the US based oceanic servers!
Its 2012, we all know its a different time to 2004-07, and we all know that this can be done, but as i stated above, blizzard shot themselves in the foot, they had the chance to do it, its gone, now they just brush us aside with their politician sounding answers, I would love to see this happen, as PVP for Australian's is not competitive at all, PVE is easier but still have some problems, but aside all that, if you're still playing the game, you'll still be jumping over the great blue ocean just to hit the shores of Azeroth!