The free falling USDJPY broke below 100 last week. Given it found support at ~98 back in 2009 and the fat divergence in the MACD, I think it could bounce from around this level.
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It's very hard for CBs to embark on extensive money printing operations without the support of the issuer of the reserve currency for which most commodities are exchanged, some exclusively like crude oil. The US may have removed dollar gold backing in 1971, however since that time it has devoted enormous effort (both diplomatic, military and covert) in securing dollar backing by the next best commodity - crude oil (world consumes ~90 million bpd / ~$3T/year), RE: petro-dollar.
Some are of view that the JPGovt would have cleared its new agressive QE program with the USGovt in order to ensure backup support of the JPY by the USFed. With the BOJ owning ~$1T USTs, it also has the option of selling USTs (buy JPY) to create a floor for the USDJPY. This option is available as the USFed is openly buying all excess USTs that come to market in order to suppress interest rates and reduce USGovt interest payment outflows.