(almost slightly)BOLD PREDICTION! PS4 will catch WiiU in Japan in 2016

[Mummelmann]

That depends, we haven't seen the impact a truly big Japanese centric franchise might have on the PS4's hardware sales, most of the bestsellers on charts now are Western centric games with less appeal.
We have seen Zelda remake, NSMB, SM3DW and quite a few other titles launch in Japan but the baseline numbers are still very low.

I think you might be right but in the end it'll be more about an easy target than an actual laudable sales feat, in my opinion.