I don't think the Orange Bowl has a lot of choices. The Big 10 and Pac 12 are locked up, as are the Big 12, and SEC. Assume that #2 SEC sticks with the Sugar and #2 Big 12 sticks with the Fiesta, and you run out of choices real quick. Also, assume 1 each from Big 10, Pac 12, Big 12 and SEC, so everyone else gets knocked down a peg further. Now you are at #4 SEC or Big 12, #3 Big 10 or Pac 12.
I suspect that the Big East will get an alternating deal with the Fiesta and Orange, with the two bowls taking turns with first choice, but under no obligation to choose a Big East team unless that team is in the Top 15 or Top 20. The Fiesta would have no problem taking Boise State or Houston, and the Orange wouldn't object to Louisville, Rutgers, Cincinnati, USF or UConn.
Where the Big East will get in trouble is if the champ is 8-4. I don't think any major bowl wants an 8-4 Big East team, and I can not blame them.