Great idea, but the match should end around 100 frames after the person is knocked out.
Scenario 1 (once knocked out the match still runs): You get knocked out but there is still 800 frames of boredom left.
2, (match immediately ends at K.O): You get a K.O. But the match ends in a terrible pose.
Because of these things that could happen depending on the way the feature is implemented, the best thing to happen would be if there was a specified amount of frames after the K.O. Where the winner has time to pose etc... This is a fantastic possible feature, but depending on the implementation, it could have quite a few faults.