Going to disagree with you putting Oregon over Notre Dame. I'm no Irish fan, but they actually beat Stanford and won in Oklahoma. Oregon has put up prettier numbers, but they don't have any wins close to as impressive as those two (having lost to that Stanford team in Eugene yesterday).
And I initially shared your assumption that Oregon could make the title game if ND loses to SC, but if Stanford beats UCLA, that knocks Oregon out of their conference title game, not even winning their own division. Unless you're in the SEC, I think voters will require that you win your division to make the title game.
If Notre Dame loses to USC, and Stanford beats UCLA, I think #2 ends up going to the winner of the Florida - Florida St game. Both are at 1 loss. 1 loss ACC winner Florida St would be a sane choice, as would a 1 loss Florida team playing the Winner of the Georgia/Alabama game.