aLkaLiNE on 08 March 2015
According to VGChartz, from last years March 1st it took until somewhere between December 6-13 to sell another 10 million units. I'm certain this includes ever so slight under tracking. This year so far it appears that the PS4 is trending around the same level but we can also assume the China launch will provide at least a modest increase to baseline (maybe 10k each week?) along with a greater number of exclusives being released throughout the year and a projected pricecut coming before then.
With Uncharted 4 releasing this year as well to inevitable critical acclaim, I'm gonna say that to reach 30 million sold through, PS4 will do so halfway through October. It really depends on timing of Price cut and Uncharted release however.
