I sympathise with many of your points -- kinda feel your expectations for the Hunger Games were a bit high though. There's a lot more lacking from those movies than violence depiction. And it's also why the "no kids zone" approach is so problematic.

As you point out birth rates are falling, and society thoroughly making sure the fun stuff happens where no kids are allowed is both easier to do than ever, and accelerating that trend to an extent that is hard to describe.

I think people will still want kids, and couples in the right time and place will have one. But not two, or three. Because once they'll experience how it feels to be cut from society as an adult for about a decade, it's a real tough choice to go through that again given all the other sacrifices (career, money, housing, the sheer grunt of it) while getting no sympathy for it ("previous gens all did it, why you complain ? Also can't that kid shut up ?")

"no kids zone" in all nice places is fine if we all accept that we don't really need population renewal or have alternatives ways to preserve our species (There must be some movie with a plot of growing kids on a farm upstate until they're ready for societal life ?)