It’s a bit more nuanced that this.
1) FBS conferences generally prefer all sports members, partly driven by the requirement for them to have 8 full members or lose status. MW converted Hawaii to full member status for that reason, in spite of additional travel expenses. They revert to a football only member when necessary, usually when it is a unique situation involving longer distances (eg: Hawaii and NIU). Nobody really wants to send 16 sports clear across the US if they can avoid it. Even ACC had to work around things in an unusual manner to make that work.
2) FBS conferences generally try to avoid FCS additions for appearance reasons. The probability of adding a FCS team for football only feels relatively remote. It is more likely that MW would add/upgrade UC Davis before adding another FCS school as football only, given that choice. The parallel would be when the Big East offered to upgrade Villanova to FBS years ago, but Villanova declined.
I think our opportunity will most likely come for full membership in MW, if they lose enough schools to be forced into adding FCS members.
There’s also a chance of MAC adding a western flank/pod, but it probably needs to include more than NDSU. I would guess 2 or 4 dakotas in that scenario.