The current strife between the NFL Player's Association and the NFL would give the impression that the NFL as a league is one that should not be reckoned.
However, from 1983 to 1987 the USFL gave the NFL a run for their money with their brand of Spring Football.
Using gimmicks and celebrity as well as high profiled owners (Burt Reynolds and Donald Trump to name a few) the USFL is an underdog story, and America loves an underdog.
Focusing around the class of future NFL Hall of Famers such as; Jim Kelly, Steve Young, Herschel Walker, Reggie White, George Allen and Marv Levy, a film about the USFL could have tons of big name draw.
A legitimate story about the league would go a step further than the comical "The Replacements" or melodramatic "Any Given Sunday" and reflect on a day when the NFL weren't the only football league worthy of mention.