OK, so I'm just half-serious, but this would introduce the possibility of a power-player actually losing a game by not treading softly enough (eliminate all races = no win, last race surrenders to you = no win, last planet falls to influence = no win).
Would surely mean an interesting game, don't you think? A game with Alliance Victory only, where you'd better keep the "closest" race alive until the end or face working an enemy over to your side?
