If that is their goal, then their vision of Tier 1 college football would wither away and die too. There would not be enough national interest to sustain that small of a league.Literally. The long term goal for the SEC is a national, exclusive league of 28-32 teams broadcast under the Disney umbrella. The rest of college football would be second tier and would have no involvement in this group. And it would mostly wither away and die, or be as prominent as the CFL.
And guess what, there is no chance the NFL will allow the SEC to destroy college football. Who do you think benefits the most from a robust college football system? The NFL can't survive without the free and incredibly robust college football system. They are completely dependent on the large pool of talent that gets battle tested through the college football system.