I'm okay with this rule change.
I would be too IF it were reviewable and not totally subjective in practice. It will be more strenuously enforced against teams like Auburn who use these run/pass read combos.
The fact that it's not a penalty if an OL is engaged down field has always been part of the rule. If engaged, he could be 10 yards downfield, but that didn't stop it from getting called when it was called...which it rarely has been...up til now. Gus' attitude, and that of other coaches about this rule was always "we'll keep doing it, and pushing the envelope until they decide to start calling it". I suppose they had a plan in place to deal with it should it eventually start getting called.