I think this, as a previous poster said, is more about setting the stage for OU to exit the Big 12 than truly wanting to add more teams.
First, who can they add? BYU, UCF, USF, Cincinnati? Sure, but what do they truly bring? New TV markets, sure but the SEC could have added East Carolina, James Madison, and Houston and added markets. It has to be new TV markets along with Quality programs. Those 4 previously mentioned teams (aside from possibly BYU who has a whole other slew of issues) do not truly bring quality. Not the kind of quality to make the Big 12 comparable to the SEC, Big 10, or PAC.
Then there was Boren's shot at the LHN. Is Texas truly going to give that up so the Big 12 can have a conference network? No. They were willing to watch Nebraska, Colorado, Texas A&M, and Missouri ride off into the sunset to keep the LHN. They turned down the chance to join the PAC to keep the LHN. Are they really going to give it up now so the Big 12 can entice the likes of Cincinnati to join? No. Are they going to give that up to keep Iowa St, Kansas State happy? No. where are those schools going to go?
Then there is the issue of how happy the Sooner fans are with the current Big 12. Aside from the RRR, none of them like the fact their next biggest games are Baylor and TCU. Can you blame them? I would HATE to have that bad of a schedule every year. They know that if they could have unhitched their wagons from OK State, they could be in the PAC or SEC right now. Spend 5 minutes on a Sooner board and you will see how bad they hate their conference situation. And Boren shoulders all the blame.
This is posturing. Saying all the things he needs to say so that when asked he can say he did "all he could to save the Big 12" before jumping ship.