Skyrim is an example of a specific title that's been milked to death more than it is a specific franchise. That's a different kind of milking that's more in line with GTA V. A single game released and re-released over a period of many years is far different than a series of games or games that are part of a specific franchise.Skyrim is even more milked than the rx480 and 7970 lol
Skyrim is probably the most milked single title of all time. However, Star Wars might be the most milked franchise of all time. Both in games, movies, TV shows, and merchandising. This article contains a list of games. https://en.wikipedia.org/wiki/List_of_Star_Wars_video_games