Haven't all the industrial buildings on the eastern side of horrie miller already taken over the land of the future parallel runway anyway?
Start again Perth, don't make the same mistakes as Sydney. Build a new airport down south with train line access off the mandurah railway. 4 runways (2 x 2). But I suppose considering the government can't even commit to a new football stadium (it's been what 5 years now?), this would only be a pipe dream. Wouldn't be any airspace issues with Pearce though...