Agree about playing a special agreement with Big12/ACC, but it's not dumb to postulate that say Ohio State, Michigan, Penn State, Notre Dame, and USC go independent knowing that's the four game core of the schedule every season.
It'll happen some day in some form unless there's some radical change to current trajectory.
Indiana/Purdue/Illinois/Rutgers/Maryland/Nebraska/NW aren't some special prize compared to most Big 12/ACC/Pac schools. We're on a current trajectory where those programs all get dumped some day and since conferences don't kick members out it'll be a group going independent in a big way or a group leaving to form a new conference.
I think 8-10 teams from Big Ten and SEC forming a smaller conference or agreement of independents and ditching the dead weight makes more sense than this 30 team superleague that includes Northwestern getting an equal cut when there aren't even any NW fans in Chicago. I say dead weight lovingly because it's how about 50 P6 programs have been referred to for 15 years now.