I think it all looks just about right at the moment.
I was taught by my big brother, who was taught by my father. It was my mother (a wartime land girl) who taught me to find punctures and patch them and how to oil a chain and remove a wheel.
My children (13, 16 and 18) are keen-ish to learn but more passive than active. It will come.
They're comfortable changing pedals, (some) tyres, adjusting brakes, seat height, bars and so on... The rest will come in time. I demonstrated a BB change to one of them and he was more interested in what was on the radio. No hurry. If he wants to get it, he'll get it.
We live in different days.
When still cycling to work I was asked regularly to pop down to the bike racks to sort out a strange malfunction in a bicycle. The requesters were sometimes my age or older. I don't see it as a generational thing at all.
There were some scrawny and callow boys in their mid-20s at my office who did something called 'downhill' and could strip and replace a bottom bracket in eight seconds with all the fingers of their left hand broken.
I think the current 'younger generation' know all they need to and will be just fine. They listen to dreadful music and don't understand how to wear a suit, but they can fix things and prep them very nicely.
If I see any generation who have somehow missed the boat, it is my age-group (forty-something). There are some of us who have come to cycling late, fill our sheds with the latest plastic bikes and cannot remove a wheel. But that isn't yet a crime. At least they're out and about on bicycles.