I usually sit on the sidelines watching the Sedevacantist debate with some amusement. It is not an either/or situation. It is true that Francis is either pope or he is not pope. This is true. But whether one can know positively that Francis is pope or not pope, this is not true. No man in the world can know, positively, that Francis is pope. Why cannot a man say, Francis may or may not be pope, who is to know given the current crisis?
If the new rites of the priesthood and the bishopric are called into question - and any sane Catholic would call these into question - then we all must ask the questions: Are these Cardinals priests? Are they bishops? If they are not, then what? This whole attitude that one must be a sedevacantist, or that he must not, seems on the face of it to be imbalanced.