> The only real scarcity would be of a long attention span. I get the author's drift, and broadly agree. But I don't think it's really a long attention span that would get in the way of (e.g.) a Mars colony, or interstellar travel; it's that people's views change from one generation to the next. My kids have been imbued with some of my attitudes, sure; but I've not had much of a hand in the raising of my grandchildre…
> the Roman Empire lasted about 200 years. Chinese imperial rule lasted much longer, maybe 1,500 years? The Roman empire lasted considerably longer than 200 years - perhaps 500 years in its best understood form going from Octavian becoming emperor in ~30BCE to the fall of the Western Roman Empire in approx 470CE. The eastern end of the empire lasted in various forms for another 1000 years (!) until the fall of Consta…
The upshot, however, is that few empires last as long as 500 years, and only a couple lasted as long as 1,500 years. And those empires change a lot over the course of their existence; they weren't effective vehicles for a collective effort at, say, colonising Mars.