So many possibilities-
Florida State loses, Ohio State might be #4
The way Texas is playing in the Big XII game, they'll probably get the #4 slot if FSU loses, since they'll have a conference championship.
Florida State and Georgia loses , Georgia would drop to #3, Ohio to #4, Michigan’s first game would be a re-match probably.
They'll drop Georgia to behind Alabama who will be behind Texas, so if Georgia loses they're out, with Michigan moving to #1, followed by Washington, Texas and then Alabama.
With Texas winning, worst case would leave 3 1-loss conference champions (Michigan, Texas, Alabama) keeping Ohio State out. Ohio State needs Texas to lose as much as Alabama does. I just don't see a way for Ohio State to get in with Texas playing like they are in Dallas.
Possibilities I see (assuming Texas doesn't royally screw the second half:
Georgia wins, Michigan wins, FSU wins - Georgia, Michigan, Washington, FSU
Georgia wins, Michigan wins, FSU loses - Georgia, Michigan, Washington, Texas
Georgia wins, Michigan loses, FSU wins - Georgia, Washington, FSU, Texas
Georgia wins, Michigan loses, FSU loses - Georgia, Washington, Texas, Michigan
Georgia loses, Michigan wins, FSU wins - Michigan, Washington, FSU, Texas
Georgia loses, Michigan wins, FSU loses - Michigan, Washington, Texas, Alabama
Georgia loses, Michigan loses, FSU wins - Washington, FSU, Texas, Alabama
Georgia loses, Michigan loses, FSU loses - Washington, Texas, Alabama, Michigan