http://www.novusordowatch.org/wire/is-francis-a-valid-pope.htmI believe it matters whether Francis is Pope or not especially in regards to those who have come to a conclusion either way on the topic, and even more for anyone who tries to bind this on other people's consciences.
First because:
Furthermore, we declare, we proclaim, we define that it is absolutely necessary for salvation that every human creature be subject to the Roman Pontiff. (UNAM SANCTAM, Pope Boniface VIII)
If the v2 leader were/are valid Popes then we are obliged to submit to what they have bound and maintain on the Church such as:
The New Council
The New Sacraments
The New Liturgy
The New Canon Law
The New Catechism
The New "Saints"
It is common knowledge among those who know anything about the infallibility and indefectibility of the Papacy know that any of the above that is bound on the Church must be accepted and submitted to.
The New Council taught heresy.
The New Sacraments are some doubtful and some invalid with Baptism, Penance and Marriage (all things being equal) still valid (if performed by valid clergy in regards to Penance). Further those who attend indult/motto Masses whether the modernized 1961/2 Mass or not (think FSSP) are receiving invalid Sacraments and worshiping a wafer. Even the mere possibility of this fact, IMO, makes it matter very much whether or not the those who changed the ordination and consecration (of Bishops) rite. Will anyone dare to deny this?
The New Liturgy itself is invalid or at least doubtful and an incentive to impiety which the best of Catholics avoid like a plague. It should be agreed that a valid Pope would not give us a Liturgy that should be avoided like a plague.
The New Canon Law allows Heretics to receive the Eucharist. If valid Pope promulgated and maintain this in force then no one should have any problem with that. After all we are just the laity. We should invite our Protestant friends to Mass so they can receive the Eucharist.
The New Catechism teaches heresy but we should accept it as a sure rule of Faith.
The new Saints are a part of the secondary infallibility of the Church and therefore must be accepted by true Catholics if a valid Pope canonized them. Therefore on the feast of "JP2" we have the opportunity to pray to a likely damned soul in the prayer of that Mass. This should prove to be somewhat of a difficulty for the true Catholic who prefer the intercession of Saints who are in Heaven. Additionally if we imitate such Saints we to will be damned. So I guess here to it kinda matters whether Francis is valid or not.