You can tell by the rule changes the past few years that they are slowly getting rid of kickoffs. It's the most dangerous (top speed, high collisions) play in the football.
One, there are NFL people who generally care about players welfare and want to make the game safer. Two, from a legal standpoint, it shows the league is taking real steps to reduce opportunities for concussions.
Mark my words, within 10 years the kickoff will be gone, and kids will not play tackle football until 12, possibly high school age. It's the only way football will survive.