Respectfully disagree, since the advent of the BCS in 1998, 26 seasons (27 championships due to LSU and SoCal both in 2003):
SEC: 15 titles by SIX different teams
ACC: 5 by 3 (Miami, FL in 2001 may have been BE, but I don't really care, it would only make the point even more)
B10: 3 by 2
B12: 2 by 2
P12: 2 by 1 team.
So, since the BCS, the SEC has had more different teams win the championship than any other conference has championships. And the above count results in SEC = 15, everyone else in college football = 12.
While the SEC may be "down" this year, there is no serious argument against the SEC being the best conference in NCAAF.