I think they are going to have to get on with the Potter expansions if they are going to do them. We are 10 years since the last book came out, and 6 years since the last movie. Granted, FB stuff is an option, but for the main Potter story arc, there has to be a shelf life. Expansions of anything are diminishing returns as it is, but a 3rd or 4th expansion of a decade old story will only be worse. Potter has been the golden goose, and I am all for expansions, but at some point, they'll be better off doing something else.