At some point, if the NFL persists it's anti-American position(and Goodell isn't fired), the collapse in cartel power becomes a potential business shark card game. Like all things in life, the Pareto principle applies ie the 80/20 rule. Same is true with the NFL - one could reasonably conclude that Dallas, DC, Giants, Chicago, GB, Pitt & NE are the Big 7.
If just a few got together and convinced another 8-10 teams to create a new league, it would be tantamount to going pig in a hi-lo poker game. Without the dilution of all the other minor, 2nd tier teams, the new rump league could probably generate the same amount of revenue with less than 1/2 the teams.
Of course, for any of this to work, the teams would have sweep clean any conflicts. For one, the Kneelers, Pats and others would have to issue a strong mea culpa and promise to never do it again. The new league would have to institute rules about behavior & termination, with a collective promise from other teams to enforce a black list.
It could work. The NFL only appears monolithic, but that's fairly recent history. Up until the 50s, the league was in constant financial peril. The 50s & 60s saw (successful) competing leagues and expansion.
At present, the entire league is TV driven. A new league, with a new start, adapted to new viewing alternatives, may have come about anyway at some point in the future. If this boycott continues - as I believe it will because it's incredibly simple to effectuate by simply *doing nothing*, then the downstream effects are going to become really interesting.
I like the way you think!