In the mid 90's, when I was in SSPX seminary, 40% of all SSPX priests ordained in the SSPX (from '71-97), ended up leaving the Society for a multitude of reasons. I remember Fr. U throwing out that statistic. Of course he already had it in his mind to leave the SSPX, so that was probably justification for his leaving.
If the SSPX were a business, the CEO would need to ask himself, "Well, forty percent of all my salesmen leave the business for other companies, perhaps we need to reformulate the business model?" Perhaps the SSPX as a whole must examine its own liberalism within and ask the question, "If the priests leave, what is the root cause(s)?"
I often reminisce and ask myself, "What if Fr. James Wathen had entered the SSPX?" Fr. was ordained in 1958 and never said the New Mass. But Fr. W blasted the J's, published the book on the New Mass (the Great Sacrilege), and was hardcore on EENS. The simple fact is, had Fr. entered the SSPX, he would not have lasted more than five years. He would have been ushered out by the hierarchy more than likely.
Or, even more interesting, what if Fr. Feeney had approached Abp. Lefebvre in 1970, and said, "Msgr., will you accept me as a priest in the SSPX?" Or even Fr. Charles Coughlin, the Radio Priest, who died in 1979, a year after Fr. Feeney. I am not quite sure how traditional Fr. Coughlin was at the time of his death; but the Feds raided his church in 1942, so he must not be altogether too bad. HeHe