well, what do we do now for our personal finances?...anything?
Its a good question with no simple answer.
The key to the answer is to figure out which currency will emerge in the next few years as more stable than the dollar. There will be a lot of global grief as that transition occurs. I don't see a clear or obvious answer.
Japan has a long ways to go to get out of its worker/retiree imbalance. The Chinese are too corrupt to be depended on. I had heard the idea floated a while back that the Asian countries might attempt a Euro. Who knows?