They had one game a week, so it was a micro deal, but it was the prime spot. CBS didn't want a lot of games as it was as part of the year they slot in golf and tennis. It got less enticing for CBS over the past decade because they had to give everyone their 15 minutes. So Bama couldn't be on twice if the Vandy's or Mizzos of the world need to get their CBS match up too. That's why they didn't budge on the price.
They may not have the depth, but my point was more if CBS only wants 8-10 games, the Big 12 is uniquely set up to carve that out. CBS would just get first choice and everything else would fall to the next network...whatever that may be in 2025. Its also the only network that could fill those games easily and be excited for a $150m contract. The SEC and ACC are out, the Big Ten will want more than $300m, which leaves the Big 12 and Pac 12.
That being said, I don't think CBS is willing to pay $15-20m a game for that time slot. ESPN was able to because they didn't buy the slot, they just bought the 15 games. If they wanted, they could put the SEC on ABC at Noon (eastern), 3:30, and 7:30, while playing three other SEC games on ESPN at the same slots. No other network could really pull that off to recoup the money.