I say let them play. Honestly, I am sick of not allowing players to hit the quarterbacks. Seriously, so he got a few stitches. I am all about protecting players, but at some point, you have to protect the integrity of the game. I would imagine Sammy Baugh never whined about getting hit below the knees, and I would imagine fans back in the day didn't whine about it either. Think back to the days of Bart Starr, Dandy Don, look back at some of the hits those guys took.
Personally, I want the players to be allowed to play the game. Protect them to a point, but the ticky tack things I have seen over the past years has taken away from the excitement of the game.
My two cents,