Or they might just tell the Chinese to get lost very politely. After all, even if China's economy continues to grow at it's current pace, Japan would still be the third largest economy in the world even after being overtaken.
P.S. I know you were joking.
Well, we are all going off topic here. It is impossible for japan to become one of china's province. Japan had never been one of them. I don't know how that guy will have such imagination. All his thoughts and speeches only create hatre and threat between two nations.
PS: Japan was not a peaceful nation at all. Let's count it only invaded China once, but it invaded Korean for more than 2 times. What about the occupation of TW before WWII, and also the northern Provinces in China a few years before WWII? You can court that as one invasion, because their time line is pretty close. And what about japanese invasion of philipine, vietnam, cambodia, Malaysia, Indonesia?
Just consider that Japan is a lsland nation with very limited resource, It has to expanse its territory in order to gain more natural resource. War is only way in the past. Invasion will be the only solution for japan to survive in the past, there is no reason for japan to be a peaceful nation.
In current situation, Japan is rich and strong in military also. I know Japan eager to regain its military power and normalize itself. However, not China, but US doesn't want to see that happen. Because USA needs Japan to be its frontier outpost. USA wants Japan to remain under it's umbrella of influence.