What if, God forbid, Francis really isn't a valid pope? Then all these efforts aimed at those who believe the seat of St. Peter is empty are all just moral less wastes of time that drives wedges between Catholics. Thou shalt not doubt the papacy of Francis cry the laity of the "Resistants".
I, for one, would have nothing to blush for -- not even at God's judgment seat -- whether I'm right or wrong about the Pope question. I don't waste much time on it, I am charitable even towards those I disagree with, I don't call the Pope names or disrespect his person. But at the same time I don't let him cost me my Faith -- and all that seems like a safe position to be in!
That's why I like the old SSPX R&R position. It's prudent, it gets all the benefits of sedevacantism (keeping aloof from the Novus Ordo contagion, keeping the Faith) but none of the "excesses" (personally declaring the Pope deposed, which isn't really for laymen to decide, or editing the Pope's name out of the Canon, which is called for in the Roman Missale, or obsessing over the Pope, trying to convert others to sedevacantism, slipping into dogmatic/schismatic sedevacantism, schismatically cutting oneself off from various groups of Catholics, etc.)