Yeah given their revenue figures it would seem safe to say they e sold upwards of 10 million copies if not more. How many of those 3.2 are going to jump ship during the holiday season when other great games come out? I bet we don't get another update.
That being said, 3.2 million is damn impressive.
Figures I saw something around 5 million copies sold, given that this isn't always going to be the same 3.2 million people and over half still playing as an average after games like Drive Club and Forza Horizon are now out I don't think it's doing too bad,
Of course people are going to move on to newer games when they come out but that's just normal.