30,000,000 rich people in China? That's a rather bold assumption. Possibly rich by Chinese standards, which means owning a car and living in an apartment with more than one bedroom.
Look at it another way: if each of your 30-million "rich" people spent an average of a million dollars on North American real estate, that would amount to $30-trillion, which is far more than the annual Chinese GDP.
I can`t imagine the Chinese government remaining passive over that state of affairs.