Lots of discussion itt of criteria that are at best of lesser importance to the B1G. For serious consideration by the B1G, a school MUST have: (1) a distinguished academic brand, almost always measured by AAU membership, AND (2) a prominent national athletic brand, probably best captured by some index of overall athletic popularity with football #1 (not geographic tv market). When Nebraska was admitted it barely passed the first test and easily passed the second.
A number of the schools mentioned here, e.g., Houston, FSU, Clemson don’t clear the first bar, probably rendering the second moot unless you were Notre Dame (also now AAU). And several P5 schools that are fine on the first are very iffy on the second, e.g., Cal, Wake Forest, Vanderbilt, maybe even Stanford.