The Japanese yen is falling hard and fast, it's very heavy. But nothing moves in a straight line forever.
The falling yen has pushed stock markets higher, increased volatility in commodities and bond markets, but at the yen current levels the noise from German and US exporters at the loss of market share could be a reason for a slow down. After all hedging last so long. If the yen stalls this could also see the stock markets pull back (as the SP500 is highly correlated to the AUDJPY).
RTT uses the RTTTrendStatus tool similar to many folk using sigma (standard deviation) to determine how far price is away from the mean. In the past RTTTrendStatus -15 (on weekly data) has been a very good place to watch out for a trend reversal in the FXY (or USDJPY).
Point: A turning FXY (USDJPY) will also be correlated with a turning SP500, and of course a rise in the 'fear' trade. Watching and waiting.