The problem with this analysis is that Alabama and LSU are easily the two best teams, by any measure. So, having a team other than Alabama in the game would also not be a legitimate national championship game under the current system, which is supposed to pit the two best teams.
The irony of this is a number of years ago, the SEC pushed hard for a 4 school playoff system; where the top 4 teams would play it out for the championship (because an undefeated Auburn had been locked out of the championship game). No other conference would even consider the SEC proposal.
What makes it doubly ironic is the SEC has won every national championship since they made the proposal for a 4 team playoff system.
A four-team playoff is perfect, it solves 90% of all of the problems with the current system. It would just be diminishing returns to include more teams.
That's a false statement -- while LSU was a consensus #1 going into last night, Oklahoma State (0.950) was ranked higher than Alabama (0.930) by the computer rankings. It was the subjective rankings by the Harris and USA Today polls that put Alabama in that game, which only goes toward the argument of SEC bias in the polls.