On Sunday, the Vikings played their last game in the Metrodome during what has been a dream season. Brett Favre quite likely played in his last game ever in the Metrodome during what has been a dream experience.
I see the Vikings' late touchdown pass as a bow to the fans: a thank you, and a last chance for the Thunderdome crowd to show its appreciation.
It's possible that Sunday is the last time the Minnesota Vikings will ever make their fans happy. I don't think they ran up the score, but came out for their bow.