Some people don't know how to put things in perspective. This new leaderboard would probably be more beneficial to the people on the current leaderboard.
Example:
Sarah is so good she probably gets very few points from her wins thus making her have to spar a lot to maintain her spot. With the new system, all she has to do is go on a couple streaks and she's at the top.
A wins leaderboard would reduce the cancer in the spar community and make it a win win for both the good and sucky sparers.
I'm also in favor of not letting the memories of players that put in the time to get their wins fade away.