Re: Mark Cuban: "Greedy " NFL Is 10 Years From Implosion
The NBA won't implode so long as the owners hold such a distinct advantage over the players union and continue to make money hand over fist.
The biggest threats to the NFL's current model are injuries/insurance (concussion lawsuits, life insurance/stipends) and the dissolution of its developmental system.
Recent lawsuits have forced the NCAA to stop production of video games and certain merchandise sales. Further lawsuits could change the 'student athlete' definition (paid collegiates or a minor league system).
If the NFL had to finance its own minor league systems (like MLB and the NBA) then that would affect its 'bottom line'. A better player compensation plan would, too.
Cuban's comments only hold true in an over saturated market, but the NFL's season is so short and well-marketed (weekly events culminating in the playoffs) that their popularity shouldn't wane unless even more AFL-like rules affect public perception... but that seems unlikely (on a large scale).
As for leagues more likely to implode, the NHL has to be #1 on any list. It has two work stoppages in 20 years and it doesn't make nearly as much money as any of the other 'big three' leagues.