A number of schools like Boise State and San Diego State rushed to join the Big East when it was still one of the big-conferences with gauranteed slots in the BCS. Now that Big East has been demoted to mid-major status for the revised system, there isn't as much of a cache to the Big East, especially when most of the major players have moved on to greater pastures; Rutgers is slated to leave for the Big Ten and UConn is now rumored to fill the spot in the ACC vacated by Maryland.
Boise State and San Diego State are slated to join the Big East next season, but the Big East might not be much ahead of the I-AA Big West by the time the dust settles, and they might look to do what TCU did and pass on the Big East to find better pastures elsewhere. A retooled Mountain West starts to look more of a peer with the Big East as it essentially becomes mostly promoted C-USA and Sun Belt schools outside of BSU and SDSU.
Broncos tend to buck their riders and Aztecs tend to cut out your heart.