I think we're going to have a much weirder and more conflicted future than people realise, given that at some point all the world's democracies are going to be populated mostly by the descendants of groups which have a lot of kids.

Yeah, sure, maybe some of us will Wall-E into oblivion. People already do that with opiates and video games and it's reasonable to expect more might do the same.

Do we really think the Amish are going to do that, though? They might even ban AI from providing goods and services to them. And then consider the kids of the Amish, who are not all going to be Amish but who might learn a thing or two and pass it along to mainstream culture. Then do that for every group that's still reproducing.