They can't have their cake and eat it, too.
If they want to protect their star QB:
1) don't put him in some other position, or
2) change the rules to require QB's to wear a distinctive jersey that means they can't be contacted if they don't have the ball, AND they can't get involved in the play. Once someone else other than the designated QB has the ball after the snap, he is out of the play - period. Even if B is running back a fumble/interception, he can't block anybody, influence anybody to change their path of travel, or even attempt to make a tackle. He might as well just go take a seat on the bench.
Would that still be football?