Theoretically games like this SHOULD be system sellers. They are unique and really hard to define. I think there may only be 2 system sellers left and those are Halo and GT. Which is strange because there is a ton of parity in both the racing genre and FPS genre but a system seller requires a rabid fanbase and both of those franchises have it.
Single game system sellers are so rare nowadays. I dont think people make their decision based on a single game except maybe the 2 aforementioned franchises.