The "caring" factor you refer is directly tied to the in-state alumni bases and TT and OU are in a tier behind UT and aggy and that tier is significant so your hot take of no one caring in TX beyond UT and aggy is way off base. Both OU and TT have significant alum/fan bases in DFW especially.
Obviously the private schools (BU, TCU and SMU) don't have the alumni numbers and historical success of UT and OU to pull in big time TV numbers even when they are CFP quality (e.g. 2024 SMU). But all 3 have the financial resources and committed alums to be successful.
Houston is another matter. Their enrollment is far higher than the in state privates but as a commuter school, the vast majority of their alums don't give a flip about UH athletics and they will never be a big TV draw regardless of how good they are. It was and always will be a mistake to have expanded with them when only UC and BYU were necessary.
I suspect many that go to the schools outside UT and aTm are still actual fans of UT and aTm and outside the years they go to school return to following said top 2.
Alumni base is not exactly a direct correlation to fan base, and as well not to viewership. This is shown in many cases, just as you point out Houston etc. TT has 41K students and their viewership if was directly tied to alumni base should be near the top, ASU has almost 60K students and their viewership is not close to the top. Nebraska has similar students at around 20K as some of the privates, and has been horrible for years, yet still has a huge fanbase and viewership, when compared. Alumni etc is not a good metric, and is a terrible excuse for teams like Baylor that has over 20K students and recent success in football, bball and wbb, yet terrible viewership and fanbase.
Fact is the VAST majority of fans in Texas are fans of UT or aTm, which has been that way for a long time. Those other schools just dont have the fan base, for whatever reason, it still holds outside of UT and aTm none of the other schools matter when it comes to viewership etc. TT for instance is average at best in the B12, and even in a small population state like Iowa, ISU consistently does better than they do in viewership.
Are there fans of other schools in TX sure, do they matter in the grand scheme of things in TX, no. Thats like saying there are fans of Waldorf in Iowa, sure there are, but it is miniscule compared to TOE. I never said there were no fans, (no one caring, was an exaggeration). But the fans that do care are such a tiny minority in the state that it barely matters.
So, for realignment purposes:
All these conferences covet TX schools, because TX, and recruits, but in the grand scheme of media valuation and viewership, those teams really dont matter. And it shows in viewership, and media value, which is what this thread is about. You say well those private schools dont have the fanbase or views because they dont have the numbers and alumni base, sure I will accept that. But that is just all the more reason they arent that valuable in realignment, because as you say they dont have the alumni or fanbase to get the views or value. My point still stands.