Why is this a "hole"? One could argue that while such a feedback loop was necessary when computers first appeared, it may not be necessary in a world where com

Why is this a "hole"? One could argue that while such a feedback loop was necessary when computers first appeared, it may not be necessary in a world where computers are ubiquitous. I don't think anybody is suggesting that PCs will vanish. Mainframes, after all, are certainly beyond their golden age yet they are still in use today. Moreover, the penetration of PCs does not need to decrease in order for them to be eclipsed by something else.