I know that OOP was just getting its feet under it, when he wrote that. It turned out to have a huge multiplying effect on productivity, but also introduced a whole new universe of footguns.
Maybe if OOP had been introduced, along with some of the disciplines that evolved, it might have been a big multiplier, but that took time.
I guess, upon reflection, each of our big “productivity boosts” were really evolutionary movements, that took time to evolve.
He really was quite prescient.