Interesting.
As a Canadian football fan (my team's the Hamilton Tiger-Cats, by the way) I don't have a direct dog in this fight either. BUT... being from Western New York and Bills territory (which again means no dog in this fight) I could never imagine rooting for the hated New England Patriots "to rep us in the AFC East." In fact, I'd rather root AGAINST the Patriots.
Yeah, I know I am a bit odd in that way. Of course, when the Bucs are facing a divisional rival, I am rooting against them. But once the game is over, I really don't have a lot of ill will toward the teams. In fact, even though the announcers will often make a lot out of "these teams hate each other," if you watch all of the hugs, handshakes, and joint prayers after most games, I don't think most of them have much "hate" either!
Free agency has eliminated a lot of team rivalries in most sports.