Stanford was also quite fortunate for face a 5-loss team in the Rose Bowl. I'm not sure that's ever happened before.
The losses of their best offensive weapons will certainly hurt, but right now Stanford is simply better than everyone else in the PAC 12 at the point of attack, and that will keep them in pretty every game. Last season they won 6 out of the 8 close games they were involved in. Will they be able to continue winning close games at a 75% clip??? I don't know.