I have discussed this issue on four different boards now. I don't think that there is much chance that the Big Twelve will survive another ten years. There is too much jockeying going on.
The ACC was a bunch of North Carolina and Virginia schools a decade ago, with Maryland being an outsider. They have added Florida State, Georgia Tech, Miami, Boston College, and Virginia Tech in order to expand their MARKET and enhance their football reputation.
The Big East was a few eastern schools. Now, it has added West Virginia, South Florida, Notre Dame (basketball), Pittsburgh, DePaul, Louisville, and Cincinnati in an expansioin that takes it from Florida to Connecticut to the markets of Chicago and Milwaukee. If the Big Ten thinks it will get Notre Dame, it might consider that the Big East is a conference that contains a lot of private schools, like Notre Dame, as well as some Catholic schools, whereas the Big Ten (11) is nearly all state schools.
Missouri has been talking about the Big Ten for forty years, and they may well fit better into the Big Ten. Nebraska has even flirted with the idea. Colorado has been flirting with the Pac Ten for thirty years. Texas has been flirting with the Pac Ten since before the SWC breakup, and A&M has been talking about the SEC all during those years. It seems that everyone in the Big Twelve would rather be somewhere else. It also doesn't seem that Iowa State, Kansas State, Kansas, Baylor, and Tech are great football schools. Missouri has more of a reputation than is deserved.
I don't see a long-term relationship between Ames, Manhattan, and Austin. They just don't seem to fit.
You might as well get used to the idea that what has been is not likely to continue.