No, of course they should not be exempt. This question makes no sense. Why would they be? Because often times, a team’s QB IS their most valuable player.
But I WILL add that I believe QB’s get too much credit when a team wins and too much blame when they lose. Especially with the media, and NFL quarterbacks. Like how they promote games sometimes. Say, New England is gonna play Green Bay, and the media promos before the game say stuff like, “Watch the battle of the Great Quartebacks as Tom Brady takes one Aaron Rodgers!” LOL.
This is just going too far. What about the other starting 21 guys on each team? As if they have nothing to do with it. Offensive linemen rarely get as much credit as they deserve for protecting those valuable quarterbacks; giving them sufficient time to throw the ball. I don’t care how good of a passer you are, if a defensive player is in your face the second you drop back to throw, you aren’t going to do very well.
(Of course, ask any quarterback, and he will readily admit to how valuable his blockers are, and not hesitate for a second to heap praise on them for a job well done. They know which side their bread is buttered on!)