Question is, where are the Chinese getting all their money from?
I've been working with some Chinese developers who tried to explain at least why some of the property was being bought up. They mentioned that cash bribes had been cracked down on and the companies get around it by sending the kids of those on the take to an aussie uni and paid for a unit. There is a ton of money flowing in and they landbank for a long time. Its only in certain areas though so I doubt it would have much effect beyond inner city.