Sure if it get bundled enough it can. But in order for that to happen it needs to be bundled a whole lot kinda like GT3 and Forza 2 was, and so far this generation Sony didn't bundle games that much except for the first Motorstorm game which got most of its sales due to bundles. Also I think your underestimating the final sales for Halo Reach by the time it will be out of print it will sell more copies then Halo 3 so at least 11.5 million copies.