I think what you're describing Anubis is likened more to a simple Ladder system, which actually has been done before back in the day actually. Just google 'worms 2 ladder' and you'll find the old Case's Ladder: Worms 2: B&G standings and Worms 2: Roperz subdivision as well. In that system (taken from their Rules page):
-When you defeat a member that is ranked higher on the Ladder, you move up in rank half the distance between their rank and your own.
-Your rank on the Ladder does not go down if you lose a match unless your opponent is ranked DIRECTLY below you.
-When members ranked below you are victorious against members ranked above you, it's possible the member will jump over you in rank and you will move down one rung. This depends on the ranks involved.
It's not necessarily all that bad of a system, in lots of cases it can be great, but as you can see --> these were for specialized one scheme standings, so such a system would likely not be a great overall system for a collection of schemes like we do for Classic.