TV revenue does drive what the NFL can ask TV affiliates for, you are correct in that aspect but NFL doesn't get a yearly check from the TV affiliates based on how many people were watching, they've signed a contract. So a team moving to Los Angeles doesn't immediately impact how much money they can make. CBS, NBC, ESPN/ABC and FOX contracts run through 2022. Could they ask for more money in 2022? Sure, but the NFL has been getting more money on each contract since the 1980s. Also, it's not like the NFL hasn't been seen on TV in LA, so it's not like they are gaining a brand new audience. There are still the same number of possible eyes watching in LA.