Boise St. is 14th in the BCS, Auburn is 6th - that's a huge difference.
Assuming Auburn wins this weekend tehy will be 5th in the BCS since West Virginia will fall back.
Auburn is the second highest ranked one-loss team in the BCS. Florids is the highest ranked one-loss team. If Florida loses and Auburn keeps winning it seems likely that Auburn will at least be third in the BCS after the Ohio St.-Michigan game. They could be second depending on how everyone ranks Louisville and if Louisville can get by Rutgers.
I wouldn;t say its highly likely Auburn makes it, but if a one-loss-team does make it this year, its more than likely going to be Florida or Auburn that does it.