The SSPX will remain in “imperfect communion” with the Holy See until the Second Coming if the Old Believers’s schism in the Russian Orthodox Church sets any precedent.
The latter are still protesting against liturgical and disciplinary changes that were made in 1666-67.
Let us pray that is not the case.
I was a protestant. I do not believe that the reasons that Luther left are extant to the Church today. I decided it was time for me to come back to Rome.
I don’t have any sympathy for the SSPX folks. Yes, obedience is hard, but if I can come over, so can they, and they grew up with the Church, while I did not.