The risk of a crisis is very real; even if the risk of default is low, the risk of the marketing seizing up because no one wants to buy at a price sellers are willing to sell at is incredibly real.
Rents in Beijing are pretty cheap now, getting cheaper actually, while housing prices remain rediculously high. Heck, my apartment complex is prime but only about 60% occupied (the other units bought but being held for speculation alone). Something has got to give.
Since year 2000, China's household debt has gone from 8% of GDP, to now 40% of GDP as a ratio (the US is 75% by comparison). Mortgage debt has become a common problem in China. At the rate household debt is expanding in China, they'll be up to 60% in four years or so.
http://www.bloomberg.com/news/articles/2013-02-19/china-hous...
A main reason people buy properties is the lack of other type of investment. The public in general have no confidence in stock market. Housing is the only thing almost guaranteed to make money. As financial reforms such as allowing investing overseas kicks in, we should see money moving away to housing market.
Home equity is about 55-56% in the US for the entire housing market (owner occupied) and has continued to climb since the lows of the post bubble bust.