PAC12 will never get Notre Dame - too many ooc games, and too much baggage (not want to share NBC payout). Without the Texhoma 4, they hit the top MWC schools. It is a pretty easy line to follow here. Right now the best top 4 schools to grab are (in no particular order) Boise St., Utah St., Colorado St., and Nevada.
Their NBC deal pays less than the PAC12 schools get.
Back when ND "almost" joined the Big Ten in the late 90's, the money component was more obvious to use to hide the ugly selfish side and victim complex. That money matter no longer being the case, all that remains is the ugly selfishness of an institution, who even if given all the scheduling autonomy in the world by the PAC, would still turn it down...because it would mean being an "equal" with Oregon State and Washington State.
Right now, it's all about "tradition." Honestly, they just hate being equals with anyone other than themselves.
If the PAC continues to stiff the Cal State school down in San Diego, Colorado State and Utah State, to me, seem like the only MWC schools that would get consideration. And even there, USU's got a long way to go. UNR is just too small, UNM seems too aimless, and UNLV and Boise would likely always have Stanford and Berkeley types against them.