what will stand to unite these folks into a single entity will in the end, be the unity of the Faith, which is the foundation and indispensable element of the Christian Religion.
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What guarantee do we have that there will be any principle of unity in the future, when all ready we see such divisions and contentions setting in, such as SSPV, CMRI, FSSP, SSPX, and so on, each daring to point fingers of accusation towards the other and accusing them of improper understanding of Church doctrine?
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It starts with small things, and eventually grows into larger things. The CMRI, for example, claims that BoD and BoB are "defined dogmas of the Faith," but can't manage to prove their case (they rely on such screeds as those of Fr. Martin Stepanich in
The Remnant for their so-called evidence).
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Many heresies in the history of the Church have grown from small matters like this. They grow like a bad weed, getting larger and more powerful, until eventually they take over large portions of territory. That's how the Arian heresy spread, and the heresy of Photius. Gallicanism and Jansenism in France, no less, began small and progressively increased their influence. Modernism was but a speck on the radar in the early 19th century but swelled to consume the world in our own time, even after the condemnation by Pope St. Pius X that many thought was sufficient to extinguish it. But it's b
aaaaack!