Francis has universal acceptance, and according to the sedes, it does him no good: Those who accept him are not Catholic enough, they say.

But if the sedes are the only pure and true Catholics, then by the same logic, only they should need to agree upon a pope, and the universal acceptance threshold is met.

So the question stands: Why DOESN'T the sede movement elect a Pope?

Textbook example of a straw man argument. 

Can Pius the X excommunicate this pope?  Can they elect a Pope?  If so, who can we trust to be one?  Do they not all say the New Order Mess?!  So, maybe no one is available to be a true pope?  Are they not all serving Satan?  We have many prophecies that tell us what is coming.  Daniel says, Mass will come to end.  We have a remnant left.

Francis has universal acceptance, and according to the sedes, it does him no good: Those who accept him are not Catholic enough, they say.

Constantly fumbling and bumbling.  No, it is not that Francis has universal acceptance and "it does him no good".  Francis has no universal acceptance.  95%+ of those who accept him aren't Catholic at all.  According to you, the Pope himself and 95% of the hierarchy in union with him "are not Catholic enough".  That is in fact why you have severed communion with them.  Could the Resistance find some other spokesman for their cause who doesn't embarrass himself every time he posts?

95%+ of those who accept him aren't Catholic at all.  

I accept your concession.

Let me know if I can help you again.

Can Pius the X excommunicate this pope?  

He is deceased.  

Indeed, if all the Traditional Catholic bishops and priests united to select a Pope, then I'd say you would have something there.  But due to the theological fragmentation among Traditional Catholics, it does not appear as if any such consensus would be possible in the foreseeable future.

I agree.  And there certainly is fragmentation but that doesn’t mean there is no communication at all.  In fact, I’m pretty sure elections have been discussed recently.  But it is a very tricky thing to get right.  If there isn’t a significant acceptance of the pope, it will immediately become a doubtful situation.  It’s really hard to get trads to agree on anything.  So it could happen but not without a lot of prayer and penance.  Ideally, the sspx would also accept the results.  But maybe that’s not  realistic.  I’m speaking here of Catholic bishops.  Matthew is absolutely right.  The hierarchy of the Church elects popes, not the laity.

So you would be a conclavist, if there were sufficient support for it.

This more or less evinces the schismatic sedevacantist spirit.

All Catholics are “conclavists” during a sede vacante.  There is no other way to obtain a pope.  Unbelievable that you would mock sedes for not electing a pope and then minutes later accuse them of schism for discussing an election.  Get your head out of your ass!

Yes, if sede-ism was actually true, they would have correctly elected a Pope decades ago, and he would have received universal acceptance. The Pope receiving universal acceptance in the Church is the work of the Holy Ghost. When God does not approve of an election, He will not give UA. 

Here's why the situation doesn't resolve for the sedes: Only the Roman Clergy strictly have the right to elect the Roman Pontiff. But only the Roman Pontiff can appoint or incardinate Roman Clergy, among whom the Cardinals are the chief. Thus, the sedes are looking for Roman Clergy incardinated into the Roman Church to whom they can say "you are the electors of the Pope". But all those electors recognize the Pope. +ABL said, "The subsequent unanimous acceptance of the Cardinals and the Roman Clergy suffices to validate it (the Papal election). That is the teaching of theologians". So, sede-ism will go nowhere until they have Roman Clergy, which they don't.

The very fact that all the Roman Clergy recognize the recent Popes should be, as +ABL said, a sufficient proof that they are the Popes. 

Next, some sedes will claim, if the Roman Clergy don't elect, then - supposedly - any group of Bishops, even vagrant Bishops without ordinary jurisdiction - again supposedly - can get together and elect. This too leads to stalemate, because no one knows who these Bishops are, how many there should be, what agreement is sufficient etc. And all that besides the fact that the SSPV, CMRI etc don't work together and SSPV believes CMRI and Thuc line orders to be invalid. If Christianity depended on sede-ism, Christianity would end.

All this because of simple unwillingness to accept the Dogma of Perpetual Papal Successors and acknowledge the plain fact that the Popes have truly been Popes.