How to end up with no one able to put these systems together in the first place
Already, most are not able to put together these systems from semiconductor design. Or writing the OS. Or programming languages. And that is fine.
I envision that in a decade, we (the humankind) will have way more devs, creating way more apps, and not knowing a thing about NodeJS or PostgreSQL or such things that you and I take as "minimum requirements".