SVism is the ultimate "rut". Why? Because it solves nothing.
Catholic sedevacantists do not pretend to have, at this time, the "solution" to the problem. However, the first step in finding a solution is to identify the problem, which they have done.
Anti-sedevacantists refuse even to admit of a problem or they seem to think that a heretic pope is just an inconvenience.
No, that's no so.
I'm anti-sedevacantist and I admit there is a problem - I also admit there is nothing I can do about it. And no, a heretic pope(s) are not just an inconvenience, they have been a fact of life for at least the last +50 years and again, there is nothing anyone can do about it - or if I am wrong, what is there that can be done and who can do it?
The problem with SVism is that in most adherents, it becomes a syndrome, it keeps them from thinking clearly because every aspect of the faith and their salvation turns into an abnormal dependency of an empty Chair.
They believe popes cannot do what popes have done, hence they are not popes at all -and if the SVs are correct, they will never in this world, know they are correct. And even if they are correct, there is still nothing they can do about it. And if they are correct, then they are correct and can boast that they were correct and that's about it. What a waste.
But if they are wrong, and chances actually are that they are wrong, then they place their eternity at risk, which is too high a risk for those of us who understand that there is nothing that can be done about a heretical pope or a heretical non-pope as the case might be. All we can do is everything we can to persevere in the faith in this crisis and let Our Lord to take care of it in His own time.