Most PAC schools are scheduling 7 home games, a few are scheduling 8, and a few have 6 home games this year, like the Utes. The trend toward more home games is being driven by money.
Adding Big-10 games, will make 5 road games and 5 home games from conference commitments, which means to get to 7 home games the Utes will need to add two OOC home games and no OOC road games.
This means the Utes will need to either play BYU every other year, only at RES, OR, they could keep the 1-1 series with BYU if Utah gets a much larger payday for playing in Provo than they ordinarily would, possibly including getting PAC TV rights for the Provo game. Again, it's about money and keeping up with the money arms race inside the PAC.
If BYU and Utah can't come to terms, I could see Utah replacing the FCS game with a regional west 1& done game with UNLV, AFA, CSU, Houston, Fresno, Nevada, Hawaii, etc in successive years.. It would become a money game for the opponent, Ute fans would see a team better than FCS foes, and a lot of the games would be reminiscent games for older fans.
So, would BYU agree to play at RES in even years, and give up more money to play Utah in Provo in odd years, say a full 50% of gate and TV revenue. Utah only plays 6 home games, but one of the road games would be more lucrative than typical road games (thereby accomplishing the goal of going to 7 or 8 home games.)
Would BYU agree to play in SLC every other year, and then skip the odd years and let another western team take that spot for a game in SLC? (unlikely)
Or would BYU just bag the game altogether and let other western teams rotate playing Utah in SLC every year?