Since 2005 this is the number of major conference champions (Big 12, Big 10, Pac 12, SEC, ACC) with less than two losses each year.
2005 - 3 (Penn St 10-1, USC 12-0, Texas 12-0)
2006 - 2 (Florida 12-1, Ohio St 12-0)
2007 - 1 (Ohio St 11-1)
2008 - 4 (Florida 12-1, Penn St 11-1, USC 11-1, Oklahoma 12-1)
2009 - 2 (Alabama 13-0, Texas 13-0)
2010 - 3 (Auburn 13-0, Oregon 12-0)
2011 - 2 (LSU 13-0, Oklahoma St 11-1)
2012 - 2 (Alabama 12-1, Kansas St 11-1)
2013 - 4 (Florida St 13-0, Auburn 12-1, Michigan St 12-1, Baylor 11-1)
2014 - 6 (Florida St 13-0, Alabama 12-1, Ohio St 12-1, Oregon 12-1, Baylor 11-1, TCU 11-1)
I get that speculating on what might happen is entertaining but keep in mind that last year was an anomaly. If Iowa wins out they will be an undefeated conference champion which hasn't happened very often in the last ten years. For Iowa to not make it into the final four they would most likely have to put a two loss team ahead of them which isn't going to happen.
2005 - 3 (Penn St 10-1, USC 12-0, Texas 12-0)
2006 - 2 (Florida 12-1, Ohio St 12-0)
2007 - 1 (Ohio St 11-1)
2008 - 4 (Florida 12-1, Penn St 11-1, USC 11-1, Oklahoma 12-1)
2009 - 2 (Alabama 13-0, Texas 13-0)
2010 - 3 (Auburn 13-0, Oregon 12-0)
2011 - 2 (LSU 13-0, Oklahoma St 11-1)
2012 - 2 (Alabama 12-1, Kansas St 11-1)
2013 - 4 (Florida St 13-0, Auburn 12-1, Michigan St 12-1, Baylor 11-1)
2014 - 6 (Florida St 13-0, Alabama 12-1, Ohio St 12-1, Oregon 12-1, Baylor 11-1, TCU 11-1)
I get that speculating on what might happen is entertaining but keep in mind that last year was an anomaly. If Iowa wins out they will be an undefeated conference champion which hasn't happened very often in the last ten years. For Iowa to not make it into the final four they would most likely have to put a two loss team ahead of them which isn't going to happen.