Your post makes sense to me, but that G7 decision to intervene is only a couple of days old.
I would also say, it appears nothing was really done until today ??
I really do not understand all of the pressures pushing the Yen up, but if it rises to the point of curtailing Japanese exports I think that would have an overall negative effect on the larger world economy. A falling USD will help the US exports - I view that as a plus at the moment.
What happens in Euroland doesn't concern me. The socialist countries can go down the tubes and the ones that are willing to work for a living will manage !!