Many, fund managers will be mystified as was the case in 1992 when the initial decline of all time high was only seen as just a setback and a buying opportunity.
I say it is worrisome as Nikkei Index has close correlation both positive and negative to many financial markets including many developed Equity Markets of Western World.
Whilst at present it seems now that nothing can go wrong from rising equities worldwide, Nikkei Index does not seem to support the view.
Watch the Youtube video entitled " Where To From Here - for the financial markets?" that goes into extensive explanation of my reasoning and discover wider implication. Video link : http://youtu.be/XFtnRCo9Ww0
It is long but sure you will find value in the material.