The NFL was in single-digit billions (with a B) three or four years ago in terms of gross revenue. It's doing >14B in gross now. I remember in the early Pats SB years, it was more like $4 B.
To the League*, he's not anything symbolic, he's a CEO. They could give two bowel movements if the league becomes rollerball or WWE, with that kind of revenue growth.
He's bad at his job if you follow the sport. He's good at his job if you want plotlines and irrelevant eye candy... he gives you angels and demons, storylines, etc., on a regular basis. Football has quasi-political "issues" that you can angrily tweet about. There's lots of swag to buy if you have more money than sense ("color rush," anybody?), and there are great graphics with their own signature "whoosh" and "chunk" noises, so it's not really a game on TV anymore, it's more like an action movie. Hell, there's even a transformer robot somehow inseparable from the game on one network. The telestrator's gone, replaced with 3-D Madden-like breakdowns. We've always watched it for its entertainment value, and now it's turned the corner from sport to reality TV/soap opera/action movie etc. Any entertainment form we'll buy is what they're selling.
I think ultimately the concussion issue is going to kill the game, no matter what else happens with it, and you younger guys will be N.E. Revolution fans or something by the time you're a middle aged old fart like me.