I am assuming that this is a failed attempt at humor...right? I would rather go back to the Big12 than have Texas and Oklahoma join the Big ten. We can barely compete in the BIG west as it is, you want to add Texas and Oklahoma to the mix...that is a brilliant idea...
Nope. It was a valid concern, and may be again post-COVID, because the Big XII is moribund--they're not adding anyone or extending the GOR (because it takes a supermajority to do so, and Texass, OU, and Kansas won't because the GOR is up in 2021/2022).
The B1G already did homework on Texass, Oklahoma, and Kansas--remember, there was a five team Big XII to B1G deal that A&M scuttled due to their greed, so while there may need to be some updates, the preliminary work has already been done.
Texass can't realistically go anywhere unless they buy off the Texas government (this is referred to as the "Tech" problem Ohio State made light of via emails during the last bout of realignment). Baylor, TCU, Texas Tech, and Texas A&M alums, among others, won't let Texass go to another conference because it will leave the remaining schools (save for A&M) in the lurch.
Oklahoma was already part of the aforementioned five team deal, so we know the B1G is (was, at least) good with them joining. The Oklahoma fans want the SEC (because they're morons) but the folks that are wanting to raise Oklahoma's academic cache have kept a keen eye on what has happened in Lincoln--we're no Harvard, but we've improved considerably since joining the B1G.
Kansas was also part of the original five team deal, so we know the B1G is down with the Jayhawks as well. And while certain myopic folks want to slag Kansas for football, they forget that 1) Kansas has been to a BCS game more recent than we have, and 2) their Basketball program drives more revenue and eyeballs than many football programs do because of their current and past success.
Smart money is on Kansas and Oklahoma, whenever we get back to expansion talk. And frankly, I wouldn't be shocked if we see something after this season, especially considering how the Big XII is out of the running for anything of relevance already.