Seems it's doing about the same as PS2 still. https://en.wikipedia.org/wiki/PlayStation_2_salesThing is I've lost touch with what "good" PS4 sales would be, lol. Meaning, I'm not really sure if 53.4 million is gangbusters or ordinary or what.
It was the following two years that PS2 saw super growth, 20 M and 30 M a year respectively. Don't really see that happening with PS4 though.