I think this dominance from the SEC will be talked about years down the road for sure. There is no question that the SEC just doesn't lose in the big game, well not yet anyways.
My question is when does the dominance stop? I mean just look ahead to next year. We may just have another SEC team playing once again for a National Championship.
IMO, I think we win the big games because of our tough schedule we run through to make it. It is tough every week in the SEC no matter where you go and who you play. This just helps the SEC teams perform better once making it to the big games in my humble opinion.
We win in the SEC for several reasons. First I think you're correct with the schedule but I think you can go a step further. The schedule in the SEC is so difficult because of the culture in the southeast. Nowhere else, at a conference level, are so many schools so passionate about football. Passion leads to bigger budgets, fuller stadiums, and an overall more competitive environment. Second there is something to be said for population migration. A quick look at the recruiting sites will show you that the most talented states for recruits is something like this
Tier1 Florida, Texas, California
Tier2 Georgia
Tier3 Alabama, Louisiana, Ohio, Pennsylvania
So 4 of the top 8 are in the southeast and most recruits prefer to stay within driving distance of their home.
Finally the SEC is the only conference that allows programs to oversign players. Whether you agree with the practice or not it's difficult to not recognize it as a major competitive advantage for the SEC schools.
I would imagine that loophole will eventually close. Lord knows the Big Ten, Pac12, and UT are screaming bloody murder over it. They, of course, ignore that we graduate just as many of our athletes as the "good" programs in other conferences.
I wonder what the Big Ten, Pac12 and UT's excuse will be then.