The Niners-Cardinals game was the second game in which a kicker injured during a return likely cost a team a game. (Giants-Commanders was the earlier one.) The NFL should allow the team kicking off to have 12 players on the field at the kickoff (one next to the kicker), and have the kicker run off the field after they kick the ball. There is no reason to risk an injury to a specialist by asking them to do something that is outside their normal responsibilities. This is the football equivalent of risking pitchers running the bases.
The NFL wants its kickoff returns, fine. But if you're going to discourage kickers kicking the ball through the end zone on kickoffs, protect them.
The NFL wants its kickoff returns, fine. But if you're going to discourage kickers kicking the ball through the end zone on kickoffs, protect them.