In 1982 during the NFL's strike, the NFLPA planned 3 exhibition games. They had to cancel the third because so few people watched and attended the first two.
Conversely, in 1987, with all scab players for 3 weeks, the NFL only lost 20% of its viewership.
Yeah, it's 40 years ago but it's really the most recent data we have.
The teams can replace literally the entire league's worth of players and barely miss a beat.
The players would never make a dime playing without the built-in fanbases of the NFL.
Yeah because they're smart enough to incorporate your hometown into their branding.