RULE 12, PLAYER CONDUCT, ARTICLE 11. ROUGHING THE PASSER (link):
Because the act of passing often puts the quarterback (or any other player attempting a pass) in a position where he is particularly vulnerable to injury, special rules against roughing the passer apply. Players in a passing posture are considered to be a player in a defenseless posture. Any physical acts against a player who is in a passing posture (i.e. before, during, or after a pass) which, in the game official’s judgment, are unwarranted by the circumstances of the play will be called as fouls. The following principles apply:
(b) A rushing defender is prohibited from committing such intimidating and punishing acts as “stuffing” a passer into the ground or unnecessarily wrestling or driving him down after the passer has thrown the ball, even if the rusher makes his initial contact with the passer within the one-step limitation provided for in (a) above. When tackling a passer who is in a defenseless posture (e.g., during or just after throwing a pass), a defensive player must not unnecessarily or violently throw him down or land on top of him with all or most of the defender’s weight. Instead, the defensive player must strive to fall to the side of the quarterback’s body, or to brace his fall with his arms to avoid landing on the quarterback with all or most of his body weight.
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Yeah. It is going to get called. And it will increasingly get called as more quarterback contracts continue approaching the half billion-dollar mark.
Quarterback is, literally, the costliest one in the sport. Owners shell out that money. They will attempt to protect their most expensive asset.
Some fans will not like it and disagree. Get ready to disagree and disagree all the time. So, start up the 'put a skirt on them then' and 'IT'S IMPOSSIBLE FOR A DEFENSIVE PLAYER TO NOT DO THAT!!!' reactions because it is what it is.