Part of the reason I enjoy Sirius is because it's only used or has been used by a small number of major sports teams. It's not an overly common theme song whereas I've heard Enter Sandman (and a lot of the songs suggested here) at other sports venues around the country regularly. I feel like branching out to some mainstream song option is bland and unoriginal, and then it'll turn into a game of just popping around to different theme songs because now we've opened Pandora's Box.
And, as I mentioned, I sort of like the balance we've struck in recent years. Scream 'Husker' and 'Power', show an edited highlight video prior to the Tunnel Walk with some new/unique song, screen goes black, fade in the familiar low bass rumble... I'm getting jacked just thinking about it.