Ugh. When I read that study about how badly the average offensive lineman's brain is hurt (college-age and up where we're talking 300 lbs guys smacking into each other over and over), I figured something's going to have to change... but how the hell do you change what happens at the line? Those guys aren't getting the knock-out type of concussions you see with QBs, WRs, and RBs, but it's supposedly even worse over time, because there's no way to avoid it.
For the big hit type of concussions, I do believe that we'll eventually have helmet technology. Both hockey and football want that to happen badly, and it seems there has to be some way. But the small impacts that happen on every single down with the big guys? That one seems way harder to solve from an engineering perspective.