I think we're closer to a dynasty than any other exceptional run by a team in the BCS era. There was a 3 year gap between LSU titles, USC won the AP then BCS in 03-04 but they only played in the title game twice with one loss between 03-05, and Florida is the closest of the bunch in my opinion.
Truly, to be a dynasty you have to win consecutive championships or win so many over a time period the dominance is not questioned. That is why have to think the 06-09 Florida and 08-present Alabama fall short. Two titles in three years is almost there but 3 in 4 or 5 years is unquestionably dominant.
