the premise of the thread may have been off, but the sec did fall off in 2014. bama was doing the lions share in the few years leading up to that too, but theyve been completely carrying the conference since then. now during 2006-2013, the sec had at least 2 national title caliber teams and had other ranked teams that were capable of winning multiple other conferences.
since then the defenses havent been as good and more than that there hasnt been another team that hasnt been a team that has had the qb play and defense like there was prior to that other than bama. having said that, the sec was still probably the best conference in 2014 and 2015. last year however is when id say the big ten and acc were better, bama was the only 10 win team in the entire conference.