I wouldn't get too excited just yet. Microsoft announced a new deal with the NFL for a gameday app, and product placement. Now I know that doesn't mean a lot to "gamers", but you have the 18-39 male demographic, and anything with the National Football League is like having a license to print money.
Sony has MLB.... an equally popular sport.
I don't think Capt. was talking about just popularity. (which NFL is more popular, IMO)
I believe he was talking about profitability.
And NFL = more profit than MLB.
There is a reason Madden sells more than MLB games and more people tune in to the Super Bowl than the World Series.
Don't get me wrong, I love both (go Niners and SF Giants!), but the NFL is more popular & profitable than MLB.