Can China Manage a Soft Landing?

Nouriel Roubini on China's latest 5-year plan:

The problem, of course, is that no country can be productive enough to reinvest 50% of GDP in new capital stock without eventually facing immense overcapacity and a staggering non-performing loan problem. China is rife with overinvestment in physical capital, infrastructure, and property. To a visitor, this is evident in sleek but empty airports and bullet trains (which will reduce the need for the 45 planned airports), highways to nowhere, thousands of colossal new central and provincial government buildings, ghost towns, and brand-new aluminum smelters kept closed to prevent global prices from plunging.
Commercial and high-end residential investment has been excessive, automobile capacity has outstripped even the recent surge in sales, and overcapacity in steel, cement, and other manufacturing sectors is increasing further. In the short run, the investment boom will fuel inflation, owing to the highly resource-intensive character of growth. But overcapacity will lead inevitably to serious deflationary pressures, starting with the manufacturing and real-estate sectors.
Eventually, most likely after 2013, China will suffer a hard landing. All historical episodes of excessive investment – including East Asia in the 1990’s – have ended with a financial crisis and/or a long period of slow growth. To avoid this fate, China needs to save less, reduce fixed investment, cut net exports as a share of GDP, and boost the share of consumption.
The trouble is that the reasons the Chinese save so much and consume so little are structural. It will take two decades of reforms to change the incentive to overinvest.

This would really throw a hurt on the world economy.  Commodity prices would be slaughtered.  Australia would also go into serious recession, and the housing bubble there would deflate.