Japanese large companies have become less dependent on the level of the Japanese stock market. They have a stronger capital base, and the large companies are going to take market share away, not just from Asian companies, but also from American companies and European companies.
Consumer spending has become a credible engine of growth for the Japanese economy. Wages and incomes are increasing, job security is improving. It's a virtuous circle.
There may be some political pressure that the U.S. no longer wants a strong dollar, but that's not going to prevent Japanese capital from fleeing Japan, because in Japan, money doesn't earn anything.
The Japanese consumer is very isolated from financial market dynamics.