Another feather in the SSPX's hat -- lots of vocations to not only the priesthood, but the religious life as well -- both male AND female.
Actually, the SSPX doesn't set up monasteries, per se, but they are "allied" with several other traditional groups: the monks in Silver City, NM (they are 100% traditional Benedictines -- but not sedevacantist), the Dominican monastery in France, etc.
There is an un-impeded flow in and out of those locations. That is, SSPX faithful send their sons and daughters to try out vocations in these places. Also, the SSPX ordains priests for the Silver City monastery.
Sometimes, once in a while, a group will "sell out" to Rome, but there are still plenty left that haven't sold out.
As they say, "truth is one, error is many" so it's comforting that so many departments of the (insert adjective here: classic, old, real, ancient) Catholic Church have recognized each other and co-exist peacefully, just as in days of old.
In other words, it's good that several have come to the same "Tradition must live" conclusion as the SSPX. All things being equal, 15 people coming to the same conclusion is better than 1 or 2 people.
In case anyone is confused, I said all things being equal, including the objective truth of the position in question.
Abortion is not wrong because millions of people believe in it -- because that would actually be an argument FOR abortion. The argument against abortion is that it's against the natural law. NOT because many people agree with it.
I know the cynical view today is that if many people are FOR something, it must be bad. But people are for FOR personal hygiene -- I'm not going to go against that!