I don't understand the idea for the nightclub- unless they provide some sort game play utility other than being present, they will get boring really fast. It was the same with nightclubs in Sleeping Dogs, who ever visits them other than when they're on a mission? It would be cool if other players/friends could enter your games' nightclubs to swap info or weapons, etc.
But I don't support the idea for a multi-player game- definitely a single-player, but one which could have measured multi-player aspects.