They need to stop focusing on us and start focusing on themselves. To the reactionaries over there going to the SEC only makes sense because it spites us and undercuts our conference benefit. Never mind that they are getting whipped by private schools in their own conference in recruiting and spite it not a way to make business decisions.
What Horn needs is to concede they lost realignment and going to the SEC (even if they could) makes no sense for them. Right now if Horn went to the SEC all they would do is split the revenue pie without adding a substantial bump in revenue (this comes in the form of adding a new state to the conference network cable package). So they'd actually hurt the SEC AND themselves financially by joining. This is in addition to further splitting recruiting grounds, generating animosity, and sharing the state of Texas spotlight in he SEC with us (and yes, you would have to share it. Don't think going to the SEC means you've "outflanked" A&M and things will go back to the mid-2000's Horn/Sooner status quo).
What they should be doing is working with other programs to jump to the Pac-12 or Big Ten. An OU, Texas, KU, and a 4th team going to the Big Ten would be a coup. The Big Ten adds four new states to its conference network, likely increasing the payout for everyone from what is already a substantial sum. The Big Ten hems in the SEC and without raiding the ACC guarantees that conferences stability (this preventing the SEC from adding premier ACC schools). Texas would then get many central time games against power programs and gets conference games against Ohio State, Wisconsin, Michigan, MSU, and PSU.
Or they go west as part of a Pac-16 deal, organize a pod that largely plays at CST, help fix the conference network and probably secure a hefty payout, and gain access to California recruiting in addition to Texas recruiting. You get more money, to be the anchor program of another conference in Texas (without sharing a spotlight with us), quality match ups, and recruiting benefits.
Going to the SEC means further sharing of resources and splitting revenue and recruits even further. The only thing it helps for them is stoking their ego and fulfilling their jealousy.
Think bigger than just us Horn. We will both be happier.