Pretty much expected. PS4 will remain consistent and only grow from here on out, especially once we start seeing more and more AAA titles. Such is the trend of the Playstation console. Wii was on the rise for the first few years, before it plummeted drastically after it's biggest titles were released. Wii YoY will remain ahead for a good while probably, but PS4 will still outsell it lifetime by far, in the end.