The canon law first of all has to protect the essence of the faith on which then the other laws are founded. Without this foundation the whole building of the Church falls and is senseless.
If the bishops who will refuse to confess the true faith and to renounce heresies will not incur the canonical penalty of a latae sententiae excommunication for apostasy from the faith, the canon law has lost its sense. Unless they are punished by excommunication from the Church, as determined in the canons 750, 1364 §1, 1044 §1 CIC, the canon law in the hands of these apostates and their co-workers loses its sense and one not only does not have to but must not obey the apostatical hierarchy. Why? Because they are apostates excommunicated from the Church.