According to the World Bank, gross savings have fallen from 33% in 1989 to 19% in 2012;
if this chart on Google (of WB data) is accurate then Japan has fallen below virtually all of the other economies in the region. They'd be an above-average Western European nation, but that's hardly comforting.
I can't easily find data on the past two years, but if their household savings rate is any indicator of the general trajectory things have not been getting better. This would suggest that there is less room for any kind of policy to "mobilise savings" to have a significant effect.
Even more alarming is that the gap between GDP and potential GDP was -1.165 % in 2013, compared to an OECD average of -3.051 %. According
this paper review, GDP will
exceed potential GDP by 2015. Things do seem to point to Japan hitting constraints rather than it underperforming; there would need to be (either way, but in this case far more crucially) major macro-structural reforms if things are to change.
The most obvious thing would be boosting birth rates by all means possible, but increasing per-capita output is a necessity; increasing the participation of women in the workforce, restarting nuclear power plants, and a whole other host of strategies are going to be needed, and to his credit Abe has been doing that.
But the issue of declining innovation (as evidenced by the declining market share of Japanese firms) is going to have to be addressed, and the
shinsotsu culture ought to be target No. 1, but I don't know how much, if anything, Abe's done in that regard. The Koreans have done quite a bit to eradicate their version of it, and I'd say the
chaebols are more influential there than the
keiretsu are in Japan, so it should be possible (in theory).