NFL hopes 'Concussion' is box office flop

If Roger Goodell was sitting on Santa's lap right now - and wouldn't that be an Instagram photo you'd love to see -- and was asked what he'd most like for Christmas, my guess is his first request would be that the new movie "Concussion" be every bit the box-office bomb that "Draft Day" was.

"Draft Day," of course, was a 2014 pro-NFL film starring Kevin Costner and Jennifer Garner. Both the producers of the movie and the NFL thought it would be tremendously popular. It wasn't.

"Concussion" isn't a pro-NFL flick. It's a big-screen adaptation of PBS's 2013 Frontline investigative documentary "League of Denial: The NFL's Concussion Crisis." It removes the league's shoes and puts its feet over a…