It was a done deal from the beginning of the season that Emmitt would win, or come in at worst second, but only if they did the 3 couple finale like they did last year (which I can only assume they used to try to keep Jerry Rice, a mediocre dancer, from winning the whole thing). You have a show with a bunch of B-level celebrities and 1 NFL legend/Superbowl MVP, and the winner's determined by viewer votes, guess who wins. Seriously, if Emmitt danced like Master P, he still would've won.
But don't count on ABC to change anything. They'll keep bringing in the popular sports player because he'll bring in the viewers. They don't really care who wins their show.