Don't worry, it's only the best and brightest. There will be plenty of slack jawed minimum wage slaves left over from third world countries to serve the remaining elites.
I expect Australia to get a substantial boost to average IQ with the immigration from America, South Africa and Britain. I expect all three of those countries will see ever accelerating shifts downward in the Bell Curve as everybody with intelligence quotients above room temperature leaves ground zero to the listless desperate remainder.
Although it wasn't obvious at the time to most people when I emigrated out sixteen years ago, it's damn near obvious that short of the Antarctic, there is no place left on Earth to escape to other than Australia. It's all relative and Oz is seemingly the last refuge left away from manboons, chimpmanzees and other five star enricher squadrons.
I know something that none of them know. I know that when Taiwan happens, the air over Australia will be filled with Chinese nuclear tipped cruise missiles like the arrows of the Persians in the CGI enhanced movie "300" raining down on the Spartans. So don't think this is a place to escape. Without a vault, this is just another place to die.