The mood though in Ireland is to remain in Society chapels. I don't believe people will leave en masse.
Likewise here in the States. I believe the word I've heard bandied about is "comfortable".
Most are "Latin Mass"-ers with no real clue as to why they are there or what the fight is all about.
I believe the numbers of the Resistance will be in similar proportion to the number that went with Tradition from the original Catholic Church (maybe 5%?)........in other words, very small.
+Williamson pretty much foresees this as you say, a small portion
will remain faithful and the majority will be swept away, just as it
happened at Vat.II.
He likens it to a swinging pendulum that takes out a swath of the
faithful with each downward swing. The protestant revolt was
a swing, then the French Revolution was another, and Vat.II was
another. Now it's the SSPX crisis. "It's perfectly normal that this
would happen this way."
That doesn't make it any more acceptable BTW.