True, but what authority tells us who is correct? Our own brain? Or the priests we like best? Or our fathers or mothers? Or our husbands or wives? Or our friends? Or random people on the internet?
I am really not trying to start a fight, but I have had to wrestle with this for 20 years and my best option is following my husband. The sad thing is my son is hopefully going to become a priest, but you Tom think he is not, that is the real tragedy of this Crisis.
And yes I am neurotic, but can you really blame me? 
My prayer is that their will be some sort of clear resolution in the next 5 years.
I also pray that Thuc line humble themselves and get conditionally ordained by Bishop Zendesjas. But I also pray that the SSPX and the "Resistance" priest and Bishops humble themselves and remove Pope Leo's name from their masses. I know this is too simple and naive, but it doesn't hurt to pray. God can say no.



Ok first, I dont think your son definitely not going to be a priest. That's an unfair thing to say. Just that there is a doubt. And yes, I agree completely that we should pray that Thuc line get themselves conditionally ordained.
Anyway as to the question of who tells us what's right? Well that's the whole problem. As Bishop Williamson said it's suppose to be the Pope. Nobody else can tell us what to do in the same way, when it comes to supernatural matters.
However Archbishop Lefebvre laid out pretty simple principle;
Do as the Church has always done, and always believed. That's it!
The reason I am resistance is because the Church always told her faithful to distance from error. So that rules out modernist types. From your whacky Novus Ordo to your SSPX.
Then on the flip side, the Church has always been careful when it comes to the validity of Sacraments. Which is why I cannot in conscience attend Thuc line Sacraments. No matter how nice the faithful might be, and no matter how many sede friends I have. And I do have many.
Bishop Williamson didn't really verbalize it in this way, but he acted on it. Which is why he consecrated Bishops. He certainly had regrets about some of them, but he was man enough to admit he made mistakes. But it's not about personal attachment to the man, though he was great.
When we look back at this crazy period in history, whether we're still alive or in purgatory, I would like to think that most of us would like to feel we had the same level of perseverance as the martyrs of old, and as the Church appeared to fade from view and die, we held to the sure knowledge that it cannot and never will.