First, trust me that whatever level you believe in the NFL being real, I was at a higher level. It took years for me to come around...and its painful.You realize that in your scenario, other billionaires have to agree to be given the short stick and have their bottom line affected. It also requires that hundreds, if not thousands, of people have to have kept the secret for 30+ years. I am not a billionaire but have a hard time believing that any of them are willing to bear the brunt of a guided league and all the lost money that entails. It's beyond fantasyland to buy into this.
Point by point..
1) "Other owners would have to be cool with losing money.
A: 75%+ of money made in the NFL is shared money. If a dad buys nose bleed seats for his family at a Denver home game, the Seahawks get a cut of that ticket sell.
Now it boils down to creating the best story line across the league to create the most sells to distribute to all of the teams. Yes today's Seahawks loss sucks, but the seahawks will make a crap ton more with Brady in the playoffs due to viewership and sells...so are they really losing money? No.
2) "Millions of people would have to keep thier mouth shut for this rigged system to work".
A: Reasons to shut up about it...
1) Legally they have to. Players have said they signed contracts saying they can't speak about it being rigged. At least 1 player said he would talk about it but all costs would have to be covered.
2) Every player feels like a hero, why say to the world "The reason you think I am awesome is a total lie".
3) Any future employment through the NFL or broadcasting would no longer be available to that player/coach.
4) Football is genetic, many players create future players. If Archie Manning sold out the NFL back in the day, his boys wouldn't have been rich off the NFL. Why hurt your family?