I suppose it depends upon the doctrine.  The Doctrine of Discovery is one from the fallible magisterium while that of the Blessed Trinity is of the infallible.  Yesterday's Gospel is the same as that of today and tomorrow. 
Jesus' humble heart also said, "The scribes and Pharisees sit in Moses’ seat. So practice and observe everything they tell you. But do not do what they do, for they do not practice what they preach."
A.L, as it stands now, is a practical failure.  Different dioceses making contradictory statements, etc.  One cannot even do what one is told because no one is doing the telling.  Thus the need for the dubia and for the pope to respond.