While most of the conference realignment talk and maneuvering has focused on football, Boise State's move to the Big East could be impacted by their other sports.
The university is currently searching for a conference to play its non-football sports in. San Diego State, who is set to join Boise State in the Big East as a football-only member, is assisting BSU in their search. It's possible Boise State could forgo the move to the Big East and stay in the Mountain West if they are unable to find a conference for non-football sports. If Boise State did end up staying in the Mountain West, San Diego State's move to the Big East could also be in jeopardy. Via U-T San Diego:
SDSU’s contract with the Big East states that if Boise State does not join the Big East as planned, the league will "discuss in good faith" SDSU’s admission into the league as a football-only member.
"For clarity, neither party shall be obligated hereunder in the event that the conference does not have as a member on (July 1, 2013) at least one football-playing institution that is located west of the Rocky Mountains," the contract states.
The Big West conference, where San Diego State will play its non-football sports, could be an option for Boise State. The WAC could be another option, depending on what happens to the conference after recent departures.