And when Sac State leaves, take U South Dakota?
If Sac State leaves, and if they do the NDSU+SDSU+UND expansion option prior to Sac State leaving, thus making a 12-team 2-division alignment, then the following option would be possible for the BSC:
1) do nothing, stay 11 and go back to 1 division; or
2) change their minds about SUU. It seems the BSC President are pretty much against adding them; or
3) find another academically acceptable 12th member. The only school left even discussing a move up even close to the BSC footprint that also plays football is St. Cloud State. They could be a candidate if they chose to move up and the BSC Presidents found them academically acceptable. They would be a far distance school from most of the conference, but close to NDSU, UND and SDSU. However, is Minnesota "Big Sky Country?" Although that question may be a bit arbitrary if they are acceptable for an invitation to the BSC Presidents. USD on the other hand is likely to be academically acceptable, they have a lot in common academically and institutionally with Montana, Montana State, and what would be newcomers to the BSC, NDSU, SDSU, UND. USD isn't too much farther west, but would be similar to the othe Dakota schools. Though being in southeastern South Dakota, they are a statewide team and certainly Central and Western South Dakota fits the "Big Sky Country" label more than St. Cloud State, though again that could be an arbitrary reason. This would all be dependent upon whether USD gets out of its financial situation and finds funds to do the move up. But Sac State leaving may take some time too, and could allow some time to expire for USD to catch up. The other thing is NDSU, SDSU and maybe UND all go to the BSC and then a few years go by, and USD (and/or SCSU) overcomes all these challenges and moves up and end up in the Mid Con/Gateway or remnant GWFC; or
4) Hope either or both Cal-Davis and Cal Poly change their mind about leaving the Big West and joining the BSC.