To condemn as heretics those who believe the Pope would cease to be Pope if befallen into obstinate heresy is not only to condemn St. Robert Bellarmine's opinion on this (something the Church has never done), but also to condemn both Archbishop Lefebvre's opinion that it is possible and Bishop Fellay's opinion that it is possible. Would those who condemn most vehemently those who believe that the sede vacante is a possibility, also openly condemn St. Robert Bellarmine, Archbishop Lefebvre and Bishop Fellay? This is where deceit comes into play demonstrating that they hold to the spirit of division.
“Heresy, schism, ipso facto excommunication, invalidity of election are so many reasons why a pope might in fact never have been pope or might no longer be one. In this, obviously very exceptional case, the Church would be in a situation similar to that which prevails after the death of a Pontiff.” (Archbishop Lefebvre, Le Figaro, August 4, 1976)
“If he (Pope Francis) continues as he does now, maybe we will be obliged to say ‘he cannot be pope!’ I say ‘maybe’ I don’t know. (Bishop Fellay, Oct 13, 2013 St. Vincent Church, KC,MO)