Switch to rugby-style tackling (like the Seahawks), get rid of facemasks (per Ditka), maybe introduce per-position weight limits, get rid of kickoffs, tweak the other rules a bit, and we can probably keep the game mostly intact and reduce concussions.
They'll never be fully eliminated, though. In any sport.
And if the worst damage comes from positions like lineman and linebackers repeatedly hitting their heads on every down during the course of normal play, how do any of those changes fix that problem?
They'll never be fully eliminated, though. In any sport.