Japan is a country with too many people saving too much money. So, one proposal: institute a small yearly wealth tax. Avoids a lot of the problems with inflation-based approaches, and doesn't penalize people nearly as much for having liquid assets.
Japan's savings rate has collapsed, and is in dire condition.
Via the WSJ:
http://i.imgur.com/vYsbHWg.jpg
That formerly high savings rate was the only thing that enabled the Japanese government to borrow as much debt as they did.
Now that the Japanese are no longer able to save enough money, the government can't continue to borrow from that source, and accordingly the govt. has been forced to turn to the last measure available: currency debasement.