Japan has benefited, but certainly I don't think it's the case that Japan's economy has performed very well in the last twenty years.  They had the Lost Decade.  Then they started slowly getting out of it, just in time for the Great Recession to send GDP plummeting at Great Depression-like rates.  Unemployment is apparently at a record high.  Deflation is back.  Exports were down almost 37% as recently as July.  They got a boost last quarter from global stimuli, but the consensus there seems to be that they're simply going to slip back (less to be gained, too, with China and America ramping up their jobs programs, I suspect).

The PM did a massive tax cut that accomplished...well, nothing.

So it strikes me that you have what looks like the perfect recipe for a change in government.

Be nice to America. Or we'll bring democracy to your country.