Here it is another speculation:
Logistic costs can be cheaper if you put Australia after China. Australia is asking since 2014 to have the last round of the season. Maybe the decision of running China in October will mean that in November there will be Australia as last round and in that case it is Wales to say bye bye.

I have no basis to say it but it is funny to try to predict such moves. Hope to be wrong, I'd like Wales to stay.