The NFL is going to have address this issue in a real, and meaningful way. In doing so, they will probably have to alter football as we know it forever.
They're probably going to have to consider things like:
-Limiting the number of years someone is allowed to play professional football.
-Forcible retirement for someone who has had too many concussions, or repeated concussions over a short length of time.
-Changing, removing, and/or improving equipment.
-Altering what is acceptable in terms of tackling, and establishing a zero tolerance policy for breaking the rules that is enforced by a large fine and suspention (Doesn't matter if the hit is borderline, or a monsterous Sean Taylor type of hit. The fine and suspension will be the same so guys know exactly what they are dealing with).
-Attempting to change the culture of football via coaching seminars, player seminars, and education at all levels of football.
-Huge fines for hands to the head, with a particular emphasis on the offensive and defensive lines.
-Widening the field.
If the NFL is serious about this issue they're going to have to get creative, and put all of the sacred cows up for slaughter. It might be a difficult transition at first but eventually fans, players, and coaches will get used to it.