Cita:
One of the reasons we did wanted to do The Last of Us Remastered, was that it allowed us to test our PS4 engine and tools pipeline we’ve been working on for Uncharted 4 and one of the best ways to do that is to put a full game out. Since we basically had a full game ready to do that, it helped us make some advances on our PS4 engine development, so in the long run it will help us on Uncharted 4.
Meyer also mentioned that while The Last of Us doesn’t need to become a franchise, if they can tell a story that they feel is interesting and wrapped in an interesting gameplay package, they’ll keep in working on it. If they don’t feel that way then they’ll let it go. Right now it’s too early to figure that out.