Its like a blackmail gambit: 1.Either the Western civilization changes and restores patriarchy with massive social reforms worldwide. Feminism eradicated and modern LGBTBBQ culture purged completely in favor of traditional families and rigid social roles.
OR
2.The Western civilization dies off by boycott of reproduction. Immigrants and poorer/uncivilized people who inherit the civilization will not have enough combined IQ to manage it and it will end shortly after(crop failures, economical collapse and end of easy fossil fuel, environmental disasters,etc). The next civilization to reemerge from the ashes will not have the abundant resources for industrial technology and will be forced to remain in state of "patriarchy" forever because the ingredient for a civilization cannot be constructed. * Mass media and communications * Healthcare(organized) * Rule of Law(central law system) * Fast travel(requires mechanics and fuel) Even basic medieval quality of life was subsidized by abundant coal/wood and easily exploited open-surface mining, so there will be less material balance for any progress.