“the yeshivos” were a minority only in pre war Europe when everyone decided it didn’t matter if you thought like a goy as long as you did the aforementioned mitzvos, but soon deteriorated to abandoning those empty actions altogether.
The shift after MO showed its lack of viability was in the 90s, 2000s… it’s no longer a minority of frum people in eretz yisroel, and in America, the yeshiva has a lot more influence than New York times darshening MO pulpit rabbis who can barely fill their pews.