Yeah but here's the thing, NFL and Microsoft have a great relationship. Microsoft is an official partner of the NFL, so in that sense it does scare me that the NFL wouldn't have a problem with Madden becoming XBOX exclusive. Though on the other hand, the NFL is a business and cutting out one half of your customers and half of the revenue that Madden brings from PS4 sales, wouldn't please the NFL either.
So in a way, this could be how we land 2 NFL Licensed games where the NFL says Madden can become XBOX exclusive but we can sell the license to Sony for them to make a game for the PS4 so the NFL doesn't lose money from PS4 buyers.