If the B1G is at 20, SEC 16, Big 12 16 when the ACC gets picked apart:
These schools will get in the B1G/SEC without much doubt:
Miami
Florida State
North Carolina
Virginia
Clemson
Notre Dame
These schools would get in the Big 12 at worst, and probably 2 of them are getting in the SEC or B1G:
Virginia Tech
NC State
Pitt
Louisville
Syracuse
These schools might get in somewhere but might get demoted:
Duke
Boston College
Georgia Tech
Wake Forest
If you give 4 of these schools to each of the 3 conferences, you’re left with 3 to demote.