This is perhaps the most interesting aspect of this whole debacle in my mind. It's objectively clear that Big Ten membership isn't all it's cracked up to be for Nebraska; between being the only non-AAU school (regardless of the stock you want to put in AAU membership, the Big Ten certainly cares a lot) and being on completely different planets insofar as athletics participation, Nebraska has to be experiencing a little buyer's remorse right now. I recognize that the Big XII's footing as a conference was incredibly precarious back when Nebraska opted to leave, and it's not in some kind of stellar position presently, but their place in the Big XII was just a natural fit.
The one saving grace for the Big Ten, and it's a big one, is that their television contract pays its members more than any other conference in the country. I get that independence seems idyllic, but Notre Dame makes about half of what Pittsburgh pulls from the ACC and I question if Nebraska has the national footprint a la the Irish (or something comparable to BYU's religious clout) to make going it solo even remotely lucrative. Nebraska pulls the
71st and 107th-largest media markets in the country, so I can't see a conference like the SEC necessarily clamoring for their membership since the school isn't exactly tipping the scales come 2023 when the current television contract expires.
If I were the Big XII, I'd be doing absolutely everything in my power to get Nebraska and three other schools to join in an effort to keep the conference together once the GoR runs out. None of the sensible fits for the conference would be a cash cow, granted, but the Big XII is so narrow in terms of its reach that even mid-size markets are a good addition.