So, what if the following happens:
1) Bama runs the table and beats Georgia by 2 scores (real good chance)
2) Ohio State runs the table including easy wins over Michigan and undefeated Wisconsin (good chance).
3) Oklahoma runs the table. This would include wins against Oklahoma State, TCU and another good team in the conference championship (decent chance).
4) Georgia runs the table before losing to Bama in the SEC Championship. This would include wins over Auburn and GT (good chance).
5) Notre Dame loses and Clemson picks up a loss or has a series of unimpressive wins (decent chance). This step might not be necessary.

The playoff rankings would probably be:
1) Alabama
2) Ohio State or Oklahoma
3) Ohio State or Oklahoma
4) Georgia

This would give us two rematches in the first round including back-to-back Alabama-Georgia games. The committee would have to fudge the rankings to make most fans happy. There should probably be a rule put in place to avoid (if possible) rematches in the first round games.