If they prefer marketshare above all, before sales at current price drop too much to grant an easy leadership, if they prefer profit, anyway not so late to kill the machine, but possibly when costs allow it without losing on HW, so most probably simultaneously with a major redesign, the first Slim model.
If they keep on doing the right things and they are lucky as they were up until now this gen, the two things could keep on coinciding.
My guess is a $100 drop during Q1 2016 or later.