In the past, I would agree.
Now...not so much.
First, Oklahoma is a very small state. In terms of eyeballs, you're not going to make back the investment in OU by selling the SEC Network in Oklahoma.
Second, you're not going to appreciably enhance the conference's reputation by inviting OU. As good as they are, the SEC is already held in higher regard than the NFC South.
Third, Oklahoma State. They are politically tied together tighter than any two schools. No one is paying $100,000,000 a year to lock down the state of Oklahoma.
If Boren was simply trying to run out the clock, he would not be calling for expansion, making noise about having options, etc. I think he knows the metrics have changed and they're not in his favor the way they once might have been. And remember, even when all this started, the PAC10 was unwilling to take Oklahoma unless Texas was involved.