The Japanese are still showing up in recent sf as being a dominant force in the future. The problem is that the fertility rate in Japan is 1.4 per woman. That says that the Japanese population is on an exponential decline. In 100 years there will be less than 10% of the current population. As Mark Steyn says, the future belongs to those who show up. There won’t be any Japanese to dominate the future.
With their fascination for robots I see the Japanese future as an island playground full of robot samurai, robot ninjas and robot anime schoolgirls.