It doesn't change anything only if the rebels manage to get two kills first. And even then, if Empire can trip them even once, by snipe or kill blocking, it still has a fighting chance.
In the variant we have now, though, R2D2, if undiscovered, can win the game for rebels by himself, even if we play a perfect game, as we can't outkill him. So, I'm glad I have your support for system change