IMO, and barring a major collapse from the Top 4, Bama is done. However, I think Ohio State is as well, but to a lesser extent. While both polls have Ohio State and Alabama at 5 & 6, as mentioned, it'll come down to the rankings. I wouldn't be shocked if the Tide is 5th over OSU, who lost big at home against their rival missing their big RB star. If they are, they'll need only one of the Top 4 to lose in order to get in. Unless it's Georgia, as I don't think they'd miss the playoff outright despite LSU's fall. What LSU has done this year is very impressive.
I could be wrong about Ohio State missing out, but I don't see any way they jump USC unless the Trojan lose again to Utah. Sure the Buckeyes are 11-1, but USC is a decent program. Similar to LSU, they've exceeded expectations. 12-1 is very nice; like OSU, just one loss, but 12-1 as a conference champion over the defending champs would totally clinch their spot in the playoff