Oh goodness, is it really an all day thing?!?! (Shows what I know about football).

Does he have any friends who are just as committed to is as he is? If so.. if they have wives or girlfriends, you could always try to have Game Day parties... can be with him between games but otherwise have some girl-time in another part of the house?

I get the feeling like you're not as important... at least he warned you though! The warning in advance does show that he cares, and that he's maintaining his passions (which is healthy for a relationship). Have you asked him how he's going to maintain the relationship if he's refusing to do anything else on his day off?