Astaire-Rogers is I'm sure the best generic connection in terms of a famous real-life dance team. Its easier to overlook that because of the distinctiveness of Ned and Grace and how other than the profession there aren't real life similarities to their counterparts (unlike the more blatant Viveca Scott-Arlene Dahl ones).
I know so little about football (during ANY year) that I wonder whether Eric Wagner was inspired by an actual heir to a football team, one who was criticized for paying too little attention to the game as opposed to "swinging" with the money. Maybe someone could answer that.