You fail to realize if Japan stock market goes down at the level you are proclaiming, the US market will come down heavily. It is not necessarily us vs. them anymore. You want the japanese market to do well, as well as China and Europe.
I have Ford and TM, both doing well. The Nikkei isn't the only index falling. Everything is hedging on China. Realistically, TM's market share is larger than Ford's. There are still other markets, so we will recover.