I guess you couldn't get the subtext of my answer: As I want his happiness, if becoming a plumber was his avenue to that goal I would support it.
But you do have to realize, that with the backgound these kids get: private school, private planes (seriously!!! not mine!!!), top education, travel, mansions whatever, while some may become teachers most will gravitate towards the professions.
As an aside, this is what Charles Murray talks about when he talks about assortive mating. My son could have done anything, and I pushed him away from finance as I don't see much of a future in it compared to tech, but that is his interest. Fine. He'll be making a million bucks by 30, 35 at the latest if things go well for him. And he'll be happy and if he's not he'll do something else.
But here's the Murray insight:
Who is he going to marry? A checkout girl at Macy's? Maybe, but most likely not. He's going to be in the Hamptons, or in Italy, or at the University Club in New York, or at work, and what kind of girl is he going to meet there? One from a good family, who went to a top school, who is in a top job, who values family and education and religion and so on.
That's the kind of girl he is likely to marry and they will bring their children up focused on family, education, success however defined and so on. And this is where the real inequality derives from. Assortive mating.