It seems that the BOJ governor is speaking again and all seems well. Kuroda believes that the 2% inflation rate is attainable with the current monetary base, but is willing to go deeper into negative territory if needed. He quoted on Tuesday's meeting in Parliament:
“We aim to raise prices through an increase in inflation expectations and a tighter gap in supply and demand under QQE,”
In order for this to be the case I would need to ask where these inflation expectations will come from and how long a time frame he is looking at for supply and demand to tighten. Sure as the ageing population starts to spend more and save less, and there are less workers producing there will be a tightening of the supply and demand relationship. Back to the current decade and you have sinking growth and inflation which is far from boosting the expectations of inflation in the near term.