It looks like Dungy made the right choice but I think he will be remembered most for his role as an NFL coach.
I am interested to see how he fairs in the Sunday night games and we all get the first look.
I think the key contribution to a commentator is when they can point out nuances on the field that are missed by most of the spectators. Say what you want about Madden but I found he could contribute in this way. But he was also saying comments like "To win the game you need to make sure you score more points than your opponent"
The first principle is that you must not fool yourself, and you are the easiest person to fool - R. Feynman