After this game. It seems like naughty dog could very well pull off a 28 something later game. The game is like a perfect mix between 28 weeks later and the road. Naughty dog should put some reference from both of those things into the DLC to this game.
Even if they were to reference them, ND would have to pay the owners of those movies royalty fees, because they own "and/or similarities are trademarked, and registered to" whichever company owns them.