True, but, it would be way more than $99 year if the NFL wants to make the $700M a season it gets from DTV plus the $210M it gets from Verizon. Right now DTV charges $400 for Live view TV + online streaming of all Sunday games and loses money at that price. So guessing if the NFL opened it up to everyone, not just DTV customers, at best you cut the price 25% to remain profitable. BUT I'm also guessing NFL is going to want north of $1B for the next contract starting in 2016, so $400 is probably what the NFL would have to charge if it wanted to go it alone.
The NFL would still get money from the TV networks and cable companies, just less as it wouldn't be as exclusive of a deal anymore. There's no way the TV networks and cable companies wouldn't pay to keep showing NFL games (and the NFL still needs their physical coverage of the games).