This should reduce (somewhat) the relative value of one-shot kills, and make the strategy of killing the weakest teams as much more often than the strongest ones as you can somewhat less effective.
That and reduce scores overall.
If SG is willing to change scoring to improve AW, I just figured out a way they can re-spin the scoring to remove the horrible bias that makes bigger alliances outscore smaller ones. I think this change would make a LOT more difference than the one they are currently testing!