I might be opening a can of worms here. I have slightly different theories than maybe others.

1) Pope Francis has a miraculous conversion.

2) A priest of the FSSP becomes a Pope.  Realizes that he might not even be a priest approaches +Williamson (I figured a safe choice), to right all of things that might be out of sync.  Then starts the clean up of V2. (I know too simple and childish)

Has anyone else mused about how the Crisis may come to an end, other than the three days of darkness? I mean we could talk about the three days, but I just want to see if anyone has thought of things outside the box.

It is absolutely beyond my ability to speculate on the how. I am certain, however, as far as certitude is possible with regard to future events, that we are not at the end of the world; but rather are on the cusp of a mind boggling Theophany of Divine and Omnipotent Power.  

My mind teems with intuitions of what is going to be effected. It's all in the Scriptures and the Psalms. 

Eye hath not seen, nor ear heard.................

Under normal circuмstances, I could see a hidden silent group of Cardinals electing someone like +Vigano at the next conclave, but, naturally speaking, it won't happen ... as Bergoglio has stacked the deck with his appointees, weeded out any conservatives, mostly by attrition, as they exceeded the "voting" age.  I think that only 2 of the "Dubia" Cardinals remain of voting age, and the rest didn't utter a peep about Bergolgio's heresies.

I personally believe that it'll be around 2029, and I find the prophecy of Blessed Anna Maria Taigi to be credible, where she foretold that Sts. Peter and Paul would appear to a conclave and indicate the man who is to be elected pope.

I do think there will be one more really bad one.  There's a prophecy about a an evil Black Pope who was raised an animist and who is really of the devil and murders the current "pope" to get his chance.  Not sure how much credibility this has though, nor do I recall where I read about it.  I've looked into it, and Arinze's parents were animists and Sarah's parents were converts from animism.  Arinze and Sarah both across as a conservative, but we've been fooled before by actors, and I could see the Bergoglian Cardinals attempting to put their "wokeness" on display by electing a Black Cardinal.  Arinze and Sarah, due to their ages (91 and 78 respectively), could also be chosen as a temporary / compromise candidate due to a divided conclave, and even brought in as a "conservative" to offset the Bergoglian extreme, in a Hegelian dialectic sort of way.  Arinze is past voting age, but still could be elected.

How the crisis is resolved:

Yeah, pretty much this.

I wouldn't attempt to figure out how men could solve this Crisis, because that's NEVER going to happen. Humanly speaking, we're absolutely toast, it's ONLY going to get worse, and worse, and worse. The devil thinks he's won, he's consolidating his power, tightening his grip...

I'm firmly convinced that only God's direct intervention could lead to an end to this Crisis. That's just the way God wanted it, too.

But I'm also convinced that as much as the devil can "just taste" his complete victory, it will be snatched out of his grasp at the last moment. God WILL step in and restore the Church.

So in summary:

1. Only God can solve the Crisis in the Church.
2. God WILL solve the Crisis in the Church

Simple.The pope has to consecrate Russia to immaculate heart of Mary with all the bishops.

I expect a pendulum effect thanks to the rise of the internet. When young people today are genuinely curious about Catholicism, they don't head to their DRE or RCIA first, but rather begin online. Now, there's every mixture of error here as well, but that's where God's grace comes in to steer well-meaning individuals in the right direction. Not so long ago, real Catholicism wasn't potentially at your fingertips like it is now.

I also think the time of large-scale deliberate infiltration of the Church is largely in the past for a few different reasons. This allows the mainstream Church to shift more organically.

Right now, you'd have to still be very liberal to be willing to seek ordination from the mainstream N.O. Church which is the most likely path for future Church leadership, but I still think a very slow shift of the N.O. back toward God will ultimately be the resolution. Each individual will decide in their own place and time when it's safe to return from their respective lifeboats and I don't expect to be one of them.

I'd presume a very pessimistic timeline on this due to my assumption that if the Church were to steer somewhat in the right direction, it would awaken her enemies and once again be a major target.

History repeats itself. 

God provides the remedy when mankind humbles himself and acknowledges that he needs His help.

When the Western Schism took place men tried to fix the problem and made it worse.  Councils were held to elect new popes.  At one point there were 3 claimants to the chair of Saint Peter.

The remedy to the Western schism was an act of humility and an act of complete trust in God. 

The True Pope at the time called a council to elect a new pope and then resigned so that this could be a valid option.  The 9 day wait period of "sede-vacante" took place and then a new pope was elected. 

(See: Von Pastor's "Lives of the Popes" as a source for this.)

As for what might happen in our times...

I could not say for sure.  That is in God's Hands.  

That being said...  I think that unless a person who most recognize as pope is the one to initiate the Restoration of the Church or resign and elect another better in his place who would accept it?