Even in my lifetime, it seems like growing up has become increasingly a sort of highwire-walking. Especially in the educated segment that I find myself in, it seems like you HAVE to do certain things to grow up "successfully". When I was a kid, there were no expectations beyond getting a degree, and even that was a particular quirk in my father's thinking; my uncle did not make it a given for his kids.
Through my old school I know a guy who is also at my old uni, so I compare notes with him. Nowadays, everyone feels like they have to have an internship every year to get a job. Well, to do that, you needed to be at a top uni, getting top grades. To get into top uni, you needed to go to a good high school, and to do that, you needed to go to a good primary school.
I ended up living in this little bubble where everyone in my local area hires a tutor for their kid. The kids do the typical middle-class activities: an instrument or other performance art, a team sport, or maybe an individual sport. Everything is done with the goal of getting into the best senior school, or the best university.
The parents are all of the type who went through this gauntlet. Two lawyers, a lawyer and a doctor, finance and law, and so on. Everyone is spending a hefty chunk to afford to live here, and on their kid's education.
To circle back to the point of the article, these are professions that make a lot of money. They didn't exist in nearly the same scale as they did a hundred years ago, and London benefits from being the world centre of at least one of these formerly tie-wearing professions, so there's enough of a concentration here to make you think your kid could get one of these jobs in a few years.
But the road is long, and not every kid is going to enjoy becoming a lawyer or a banker. But it's also the case that it's hard to see how you could live in your childhood neighborhood without one of these jobs, so the parents steer the kids down the road before they are really old enough to decide.
I wonder if having fewer kids is behind the rat-race atmosphere. With all your eggs in one basket, they need to be well protected. If you had 4 kids, like my uncle, you wouldn't have time to puff them all down the same path.
It's because the gap has widened between the "good paying jobs" and everything else (the "shit jobs"). The former has become more scarce which means you have to hustle more to get them or you're getting the later.