It's hard for me to envision it being too much earlier than that -- take a look at this chart: http://www.google.com/publicdata?ds=wb-wdi&ctype=l&s... -- it's not like the US isn't a moving target.

Especially if the US and EU get serious about alleged currency manipulation -- it's funny to see a graph of US to Yuan stay virtually flat for many years dispite their economic growth: http://www.google.com/finance/chart?q=CURRENCY:CNYUSD&tk... -- compare that to organic exchange rates: http://www.google.com/finance/chart?q=CURRENCY:CNYEUR&tk... and http://www.google.com/finance/chart?q=CURRENCY:GBPUSD&tk...

Btw, it seems China is the world's largest auto market by units sold, not by dollars/yuan sold -- which is an odd way to think about it. Cars are significantly cheaper in China.