The wildlife trade definitely contributes to the increased likelihood that disease jump from animals to humans. However, it seems that most of the risk comes from bushmeat, or meat from wildlife that are not domesticated sources. As far as we know, the SARS outbreak was from bushmeat, for example. But China is not the only country that has a problem with bushmeat. Africa, also has a problem with bushmeat, which has been linked to Ebola outbreak. Bushmeat is a problem, and illegal poaching for "medicine" is a problem; but these are two separate phenomenons. What they have in common is the victim: wildlife.