Here is the point: a lot of people that had Xbox 360s and Wiis last gen now own a PS4, these dudes never played The Last of Us.
Also, a lot of PS3 owners will also buy the remastered version for the DLC, multiplayer and better presentation;
And, futhermore, THE LAST OF US is THAT DAMN GOOD: you have to play it in 2 diferent generations.