following schedule (not counting the Tuesday/Wednesday MAC games or games on conference networks like the BTN, etc.):

CBS: 1 Game (afternoon SEC game of the week)
NBC: 1 Game (Notre Dame - if they are at home)
FOX: 3 Games (triple header from noon ET through prime time)
ABC: 3 games (triple header from noon ET through prime time)

ESPN: 4 Saturday games (same as above plus the late-night slot); 1 Thursday night game
ESPN2: 4 Saturday games; 1 Friday night game
ESPNU: 3 games
FS1: 3 Saturday games (and the occasional Friday night game)

So for a "typical" week, you have for each Network Company:

1 CBS Game
0-1 NBC Game
6-7 FOX/FS1 games (3 on each)
16 ABC/ESPN/ESPN2/ESPNU games (plus a couple of Tuesday/Wednesday games for MAC teams)

Moving forward, it looks like NBC is trying to expand its games to include 2 games per week plus additional streaming games on Peacock. With that in mind, the new Big Ten contract provides for essentially:

1 CBS game
1-2 NBC games (basically Big Ten + Notre Dame = 2 games per week)
2-3 FOX/FS1 games

Looking at the SEC deal(s) with ESPN, it looks like they are guaranteed 1 game on ABC and typically have an additional 3 games on the ESPN family of networks each week.

That means that after the Big Ten and SEC have gotten their "share" of games, we are left with the following for the remaining teams:

4 FOX/FS1 games (1-2 on FOX; 2-3 on FS1)
12 ABC/ESPN/ESPN2/ESPNU games (2 on ABC, 3 on ESPN (including Thursday night and Saturday late night), 4 on ESPN2 (including Friday night and Saturday late night), and 3 on ESPNU)

So where do these slots end up? The ACC I believe eats up 3 ABC/ESPN games per week (including the Thursday night game with is a common slot for their teams). That would leave the 1-2 games on FOX and 2 games on ABC/ESPN (including the late Saturday game) as the "valuable" games left to give out. That plus a lineup of mediocre ESPN2 slots (and streaming stuff) is basically what is at play between the PAC-12 and Big 12. It will be interesting to see what comes from those talks. There is still some valuable slots that are worth money, but probably not enough to get both conferences big payouts.