He seems to think progress would look like "a new wave of built-from-the-ground-up operating systems sweeping away all the old ones every decade or so". Say, if

He seems to think progress would look like "a new wave of built-from-the-ground-up operating systems sweeping away all the old ones every decade or so". Say, if Plan 9 had become dominant in the 90s, would we by now be replacing it with something else? What would everyone moving to new operating systems every 10 years gain us? There has been mind boggling progress since the 90s, just not in the direction he expected.