*Actually, it's for 2019-2023 (haven't yet put them in for this year). Viewership Score gives an idea of what the average viewership would be for a team if all games were aired on a Nielsen-rated network.  But it gives an idea of why networks aren't shaking in their boots about "well then fans of other schools might just say no thank you"

Those teams that aren't in the B1G or SEC are in bold.

1. Alabama 5.76M
2. Ohio St 5.58M
3. Michigan 4.93M
4. Georgia 4.75M
5. Notre Dame 3.37M
6. Penn St 3.30M
7. Tennessee 3.16M
8. Texas 2.90M
9. LSU 2.90M
10. Florida 2.82M
11. Auburn 2.69M
12. Clemson 2.63M
13. Oregon 2.62M
14. Oklahoma 2.61M
15. Texas A&M 2.51M
16. Florida St 2.40M
17. Michigan St 2.30M
18. Nebraska 2.22M
19. USC 2.09M
20. Wisconsin 2.05M
21. Washington 2.05M
22. Ole Miss 2.04M
23. Arkansas 1.93M
24. Colorado 1.85M
25. TCU 1.68M
26. Indiana 1.66M
27. Miami 1.63M
28. Oklahoma St 1.60M
29. Iowa 1.59M
30. Utah 1.39M
31. Kentucky 1.39M
32. UNC 1.36M
33. Minnesota 1.34M
34. UCLA 1.32M
35. Mississippi St 1.27M
36. Maryland 1.26M
37. Iowa St 1.25M
38. South Carolina 1.22M
39. Missouri 1.18M
40. Navy 1.17M
41. West Virginia 1.11M
42. Georgia Tech 1.10M
43. Louisville 1.10M
44. Washington St 1.09M
45. Oregon St 1.07M
46. Baylor 1.04M
47. Kansas St 1.03M
48. Army 1.01M
49. BYU 1.01M
50. Purdue 0.99M

Do we really think they're concerned about losing those teams?  If they can add Notre Dame, Clemson, Florida St and Miami and maybe UNC, then the strongest viewing teams they miss out on are.... 

• Colorado (unsustainably high due to the Deion factor, not a consistent draw)
• TCU (number is elevated from the national championship run, not a huge fan base normally)
• Oklahoma St (ok, this team is accurately represented and likely the biggest possible viewership loss)
• Utah (I've heard they're only high because they play good teams, so why not just take the good teams...?)
• Navy (an outlier based on two huge draws in the Notre Dame and Army games)

None of those are brands that are going to kill college football to lose those. FOX and ESPN just aren't quaking in their boots wondering how they'll survive without the Utah fanbase tuning in