In all of this expansion talk there has not been a single team that has been as open to possibly move leagues then Nebraska.  Missouri has expressed interest in the Big 10 partly because of the inequity of the Big XII television deal, but Nebraska seems to be putting themselves out there to the highest bidder:

"My [Harvey Perlman] instinct and Tom's instinct isn't just to sit around and wait to see what bad things happen to you," the chancellor said. "We're certainly talking about what options we have."  Perlman said he wants the Big 12 to succeed. But that doesn't mean a move by Nebraska to any other power conference has been ruled out.

"I don't think anyone can dismiss anything out of hand," he said. "If you take the wildest predictions about mega-conferences - 16 is the number you see most, but 24 has been floated though not publicly - we certainly have to act in the interest of Nebraska."

The highest bidder for Nebraska is obviously The Big 10 since they can double their revenue from the $7 - $11 million they currently get from the Big XII to $22 million that The Big 10 can offer.   Money is what will drive Nebraska to the Big 10 if they are extended an offer.