I'm not sure what your question is. Are you saying that other teams have won with backup QB's, so why shouldn't the Packers?
While I do think the Packers could potentially win on Sunday with Love at QB, if I was betting on the game, I would take the Chiefs and the now -7.5 spread. I think that spread goes up to 10 by game time, after the news of no Rodgers really sinks in.
Anyway, we will get a small snapshot on Sunday of what life without Rodgers looks like. I hope Love squashes my fears that he just isn't ready yet. No matter what happens, I think the discussion right after the game isn't going to be strictly about the game results, but will eventually center around Love/Rodgers and the Packers future with or without 1 of them.