Even for Chinese standard, 200 years in the future is way too long. I also don't think eradication of the japs are possible or rational. The japs have a lot of their own problems to deal with. In the next 50 years, they might fallen behind. I'm not that worried about the japs. As long as the current trajectory keep going on, China will be so dominant that the japs aren't a threat anymore. It is the US that I worry about. Never underestimate the yanks. They have capability to surprise you. That being said, I have also never witnessed the yanks being so fragile like today.