Your logic is off, brother.
There are roughly 130 teams in FBS. Every year, one of them wins a national championship. The odds are 1 in 130.
There are 14 teams in the SEC. Every year, one of them wins a conference championship. The odds are 1 in 14.
If anything, it is a bit harder to win a championship today than it was in years gone by. For instance, back when there were only 126 teams in FBS, the odds of winning it all were slightly better, at 1 in 126. And before Mizzou and A&M joined the SEC, the odds of winning the conference title were about 12% better, at 1 in 12.
What I think you meant to say was that it is easier to get to the games where a national title can potentially be won. And that is sort of true. Today, 4 teams out of 130 get invited to play for the national crown. Used to be just 2 of 130. Then again, back before the BCS came into being, several teams could "play for a championship" by having a great regular season and winning their bowl game, in hopes of being selected by AP or UPI or Dunkel or NCFA or any of the other polls and systems that proclaim national champs.
So, arguably, it was easier to play for (and win) a national title when four or five teams could all be named the champs. Making it actually harder today.
Here's hoping we're the ones winning them, soon.
Go Vols!