Taking last things first, the school that holds the rights to a game gets paid. In this case, that money would go to the Big XII.
As to the earlier comments, I'm thinking slowly this morning, so bear with me. And I repeat that I may misunderstand the situation. Here is my understanding.
Assuming OU and UT get $40 million a year each from the conference, they would have to pay the league $80 million each as penalty for leaving. As I understand it, that's separate from everything else. That's $160 million, or $20 million apiece for the 8 other league members. It is fair and accurate to characterize that as a one-time, short-term windfall.
Meanwhile, for the next three years -- through the 2024-25 season -- ISU's revenues will be consistent to what they've been receiving. The faucet doesn't stop producing water when the gardener announces plans to shut it off. It stops when the faucet actually is shut off. In this case, after the 2024-25 season with the departure of OU and UT.
Now, I don't think anyone believes the two will actually stay in the conference that long. But we don't know yet what the lawyers will do. (I am ignoring the possibility of the league suing anybody).
Bottom line is that in the long run, this is almost certainly bad for Iowa State financially. All other things being equal, ISU will be getting significantly less money from the conference after the two schools actually leave. But in the short run, ISU might actually get more.
Again, I am NOT denying that the departure of the two big dogs is a serious blow to ISU.