I don't think you can point to human populations' imploding as they are in the West.
I don't think folks have ever before bought the lie en masse that it's better to be dead than unwanted. If we are returning to the pagan model of human worth, we should at least have the decency to pot our children -- particularly females -- in the public square and let them die of exposure should no one chooses to take them.
I think we're dealing with something qualitatively different than the pattern of sexual mores which, I agree with you, have a certain ebb and flow.
This is due precisely to the concerted attempt to essentially transofrm human nature. Witness the movement to make women more like men by affording them a mother-only right to homicide.
Can it be true that Gaia is a misogynist? Is there really something so wrong with being so absolutely fecund that your body can return a fully-formed human being nine months after receiving a sperm?
It's insidious ... I think it starts with the concerted effort to eradicate female modesty, damage the female psyche by exposing it to and imposing upon it "male sexuality" (not to mention male competitiveness in the workplace ON TOP OF female competitiveness for suitably stable and supportive partners) and thereby stunting the women in particular from being able to recognize, much less hold out for, her absolute due ... a male who would love her and cherish her and support her AND THEIR CHILDREN the rest of her life.
That's the ideal. It's not just some Christian moidel of marriage. The Christian model is actually the model of the Fittest who will indeed be doing the Surviving if you think about it.
Just as my mutt of a dog is healthier and happier and longer-lived than some wiggy, overbred pure breed ... the Naturals will win out, even, over the Manufactured -- much less the dead-at-the-get-go progeny of those who contra-vented Life or aborted their own.
As for objectification of women, you're probably on to something. One of the things many historians point out when comparing eras is that, at least in the west, women either get priviledges or rights, never both. To over simplify it women can either vote or have people hold the door for them, not both. Look at the Renesaince, women had pretty much every priviledge in the world and not one single right (note if you try to explain this to a feminist I'll send flowers to your funeral, they don't like this fact). But again this is pretty cyclical (though it's gone a lot further than any time I've looked at in the record).
Overall I think the pendulum will continue to swing and I'm pretty sure we're at the apex (notice how abortion opinion is swinging more and more pro-life, at least part of the pendulum is already swinging in the other direction). If I'm right 150 years from now whatever Muslim countries are left will have strip clubs on every street corner and Christian women will be veiled at all times (not like Taliban restriction levels, like sane Muslim countries have it). Of course it's people like you that will get the pendulum swinging in the other direction, which at this juncture is a very good thing. I just hope we stop the swing in 75 years or so when things are functional, probably won't happen though, never does.