Thats the old school way of doing things for sure. However the NFL league office will come down on that hard, both on the player and the coach(es).
Its not the old school league anymore sadly.
I agree to an extant. And I would not say take a cheap shot. I'm not at all into bush league stuff or blatant personal fouls.
But if a guy is running the read option the way rg3 did, there are opportunities to get a knock down on the Qb without being dirty. Though you would have to concede a decent run by the rb and possibly face a bs 15 yard penalty - but probably not a player fine if done within reason.
But as for Wilson - he doesn't get rattled easily and one if his strengths is that he is as cool a customer as you will see under pressure. So I don't think you are going to get him off his game as much as you would other guys by hitting him.
Also, I think that Seattle runs the pistol in a way where Wilson runs the fake handoff the way teams do when they run play action - right behind center - And then instead of passing it he runs.
I don't think they have him run outside and hold the ball to the last minute before deciding to keep or pitch it. Which is why he doesn't take a lot of hits.