Assuming for a moment this is more true for China than for other countries. Why would the average Canadian prefer to pay more for their next car versus having a similar car subsidized by the Chinese taxpayer? Most Canadians do not work in the auto industry. Further, the protectionism practiced in the EU/US/Canada is not likely to be successful long-term, meaning those auto industries are doomed.
Best path forward is to let in competition, make the domestics stronger, and let consumers get cheaper cars in the meanwhile. Provide some additional temporary support if necessary. (This is more or less how the US absorbed Japanese and then Korean cars.)