I guess you obviously missed all of the recent Chinese saber-rattling with the Philippines?
Unmentioned in this conversation is the Republic of China (Taiwan), which I have (and had since Obama's election) the gravest doubts will survive and Obama presidency.
I've toured Okinawa and Taiwan extensively. They're both heavily fortified, but in a compact manner. Like Pearl Harbor, an enormous first strike could knock them out in a dramatic fashion. The same would apply to the DMZ defenses in Korea.
After which the PLA's huge superiority in manpower could easily occupy Taiwan and the Japanese and Philippine archipelagos.