Since I haven't watched any NFL games this season, I really do not know if there is an effect from the boycott.
Are players still kneeling or sitting out Our National Anthem?
(Might there be a website that keeps a reliable tally on this?)
If I were an advertiser, I might be looking for other programming or even media to target my ad money, as I suspect that we NFL snubbers are a valuable demo.
If I were a collegiate (or even younger) football player with a possible NFL future, I might feel let down. Thus, young players in the NFL pipeline might be looking at other career choices (which could be good for them in the longer run, anyhoo.)
Well; don't watch TV to find out!
Remember when the US boycotted the Olympics?
A LOT of players were let down!