I don't know for sure, but there is always a chance that they realize the same thing now and put their money where their mouth is. This is something written with the benefit of hindsight, and could be the scenario that he might have the same insight now that we have and not had it like 5 years ago. (guessing based on the tone of the essay). The other thing is the difference in budgets. The numbers at which they invest might not be enough to scale a full fledged physical project. But I do hope they take a lead into this in the near future.
Further, I would argue that even if he doesnt follow through on this, it is still a good and important essay in the context in a sense that there is every chance this can motivate others to take action. Given his reach and stature among the entrepreneurs, there is every chance it motivates you or me or someone else to take an action - the lack of which is quite apparent today. Call to actions work even when the people mobilizing others do not act on those. Of course, putting your money where your mouth is always a better scenario, but if that does not transpire here, this essay could still inspire others.
Further, I would argue that even if he doesnt follow through on this, it is still a good and important essay in the context in a sense that there is every chance this can motivate others to take action. Given his reach and stature among the entrepreneurs, there is every chance it motivates you or me or someone else to take an action - the lack of which is quite apparent today. Call to actions work even when the people mobilizing others do not act on those. Of course, putting your money where your mouth is always a better scenario, but if that does not transpire here, this essay could still inspire others.